Bluetooth headset pairing complete on PC but not headset

Hi all,

Having an issue pairing a Bluetooth headset where my PC says pairing and connection was successful but no recognition of pairing on the headset (normally it says “connected” when successful).

The headset also does not appear as a sound device when the PC says it is connected. The device I am trying to connect is called " EarFun Wave Pro". Other Bluetooth headphones, such as Samsung devices, can pair and connect without any issue.

I’ve tried:

  • Switching between PulseAudio and PipeWire
  • Using Blueman
  • Manually pairing through bluetoothctl
  • Checking for pairing errors in btmon

Linux version:
Linux Cider 6.6.72 #1-NixOS SMP PREEMPT_DYNAMIC Fri Jan 17 12:36:27 UTC 2025 x86_64 GNU/Linux

Nixos version:
24.11.713515.47addd76727f (Vicuna)

BTMon output from a pairing attempt:

[nix-shell:~]$ sudo btmon
Bluetooth monitor ver 5.78
btmon[6297]: = Note: Linux version 6.6.72 (x86_64)                                                                                                 0.360535
btmon[6297]: = Note: Bluetooth subsystem version 2.22                                                                                              0.360536
= New Index: 84:1B:77:0C:6A:38 (Primary,USB,hci0)                                                                                           [hci0] 0.360537
= Open Index: 84:1B:77:0C:6A:38                                                                                                             [hci0] 0.360537
= Index Info: 84:1B:77:0C:6A:38 (Intel Corp.)                                                                                               [hci0] 0.360537
bluetoothctl[6243]: @ MGMT Open: bluetoothctl version 1.22                                                                                {0x0002} 0.360538
bluetoothd[1273]: @ MGMT Open: bluetoothd (privileged) version 1.22                                                                       {0x0001} 0.360538
bluetoothd[1273]: @ MGMT Command: Pair Device (0x0019) plen 8                                                                      {0x0001} [hci0] 1.933622
        LE Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Capability: KeyboardDisplay (0x04)
< HCI Command: LE Set Extended Scan Parameters (0x08|0x0041) plen 8                                                                      #1 [hci0] 1.933739
        Own address type: Public (0x00)
        Filter policy: Ignore not in accept list (0x01)
        PHYs: 0x01
        Entry 0: LE 1M
          Type: Passive (0x00)
          Interval: 60.000 msec (0x0060)
          Window: 60.000 msec (0x0060)
> HCI Event: Command Complete (0x0e) plen 4                                                                                              #2 [hci0] 2.031987
      LE Set Extended Scan Parameters (0x08|0x0041) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Extended Scan Enable (0x08|0x0042) plen 6                                                                          #3 [hci0] 2.032181
        Extended scan: Enabled (0x01)
        Filter duplicates: Enabled (0x01)
        Duration: 0 msec (0x0000)
        Period: 0.00 sec (0x0000)
> HCI Event: Command Complete (0x0e) plen 4                                                                                              #4 [hci0] 2.033988
      LE Set Extended Scan Enable (0x08|0x0042) ncmd 2
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 47                                                                                                #5 [hci0] 2.087017
      LE Extended Advertising Report (0x0d)
        Num reports: 1
        Entry 0
          Event type: 0x0013
            Props: 0x0013
              Connectable
              Scannable
              Use legacy advertising PDUs
            Data status: Complete
          Legacy PDU Type: ADV_IND (0x0013)
          Address type: Public (0x00)
          Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
          Primary PHY: LE 1M
          Secondary PHY: No packets
          SID: no ADI field (0xff)
          TX power: 127 dBm
          RSSI: -46 dBm (0xd2)
          Periodic advertising interval: 0.00 msec (0x0000)
          Direct address type: Public (0x00)
          Direct address: 00:00:00:00:00:00 (OUI 00-00-00)
          Data length: 0x15
        02 01 06 11 08 45 61 72 46 75 6e 20 57 61 76 65  .....EarFun Wave
        20 50 72 6f 00                                    Pro.           
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        Name (short): EarFun Wave Pro
< HCI Command: LE Set Extended Scan Enable (0x08|0x0042) plen 6                                                                          #6 [hci0] 2.087159
        Extended scan: Disabled (0x00)
        Filter duplicates: Disabled (0x00)
        Duration: 0 msec (0x0000)
        Period: 0.00 sec (0x0000)
> HCI Event: Command Complete (0x0e) plen 4                                                                                              #7 [hci0] 2.095988
      LE Set Extended Scan Enable (0x08|0x0042) ncmd 2
        Status: Success (0x00)
< HCI Command: LE Extended Create Connection (0x08|0x0043) plen 42                                                                       #8 [hci0] 2.096184
        Filter policy: Accept list is not used (0x00)
        Own address type: Public (0x00)
        Peer address type: Public (0x00)
        Peer address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Initiating PHYs: 0x03
        Entry 0: LE 1M
          Scan interval: 60.000 msec (0x0060)
          Scan window: 60.000 msec (0x0060)
          Min connection interval: 31.25 msec (0x0019)
          Max connection interval: 31.25 msec (0x0019)
          Connection latency: 0 (0x0000)
          Supervision timeout: 6000 msec (0x0258)
          Min connection length: 0.000 msec (0x0000)
          Max connection length: 0.000 msec (0x0000)
        Entry 1: LE 2M
          Scan interval: 60.000 msec (0x0060)
          Scan window: 60.000 msec (0x0060)
          Min connection interval: 31.25 msec (0x0019)
          Max connection interval: 31.25 msec (0x0019)
          Connection latency: 0 (0x0000)
          Supervision timeout: 6000 msec (0x0258)
          Min connection length: 0.000 msec (0x0000)
          Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4                                                                                                #9 [hci0] 2.097985
      LE Extended Create Connection (0x08|0x0043) ncmd 2
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 31                                                                                               #10 [hci0] 2.425002
      LE Enhanced Connection Complete (0x0a)
        Status: Success (0x00)
        Handle: 3585
        Role: Central (0x00)
        Peer address type: Public (0x00)
        Peer address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Local resolvable private address: 00:00:00:00:00:00 (Non-Resolvable)
        Peer resolvable private address: 00:00:00:00:00:00 (Non-Resolvable)
        Connection interval: 31.25 msec (0x0019)
        Connection latency: 0 (0x0000)
        Supervision timeout: 6000 msec (0x0258)
        Central clock accuracy: 0x00
@ MGMT Event: Device Connected (0x000b) plen 34                                                                                    {0x0001} [hci0] 2.425118
        LE Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Flags: 0x00000008
          Connection Locally Initiated
        Data length: 21
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        Name (short): EarFun Wave Pro
btmon[6297]: @ RAW Open: btmon (privileged) version 2.22                                                                                  {0x0003} 2.425297
btmon[6297]: @ RAW Close: btmon                                                                                                           {0x0003} 2.425300
> HCI Event: LE Meta Event (0x3e) plen 4                                                                                                #11 [hci0] 2.425932
      LE Channel Selection Algorithm (0x14)
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Algorithm: #1 (0x00)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2                                                                        #12 [hci0] 2.431776
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
> HCI Event: Command Status (0x0f) plen 4                                                                                               #13 [hci0] 2.432930
      LE Read Remote Used Features (0x08|0x0016) ncmd 1
        Status: Success (0x00)
> ACL Data RX: Handle 3585 flags 0x02 dlen 16                                                                                           #14 [hci0] 2.444760
      LE L2CAP: Connection Parameter Update Request (0x12) ident 96 len 8
        Min interval: 25
        Max interval: 25
        Peripheral latency: 0
        Timeout multiplier: 600
> HCI Event: LE Meta Event (0x3e) plen 12                                                                                               #15 [hci0] 2.473975
      LE Read Remote Used Features (0x04)
        Status: Success (0x00)
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Features: 0xff 0x00 0x00 0x08 0x00 0x00 0x00 0x00
          LE Encryption
          Connection Parameter Request Procedure
          Extended Reject Indication
          Peripheral-initiated Features Exchange
          LE Ping
          LE Data Packet Length Extension
          LL Privacy
          Extended Scanner Filter Policies
          Remote Public Key Validation
< ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                                           #16 [hci0] 2.474008
      SMP: Pairing Request (0x01) len 6
        IO capability: KeyboardDisplay (0x04)
        OOB data: Authentication data not present (0x00)
        Authentication requirement: Bonding, MITM, SC, No Keypresses, CT2 (0x2d)
        Max encryption key size: 16
        Initiator key distribution: EncKey Sign LinkKey (0x0d)
        Responder key distribution: EncKey IdKey Sign LinkKey (0x0f)
@ MGMT Event: New Connection Parameter (0x001c) plen 16                                                                            {0x0001} [hci0] 2.474017
        Store hint: Reserved (0xb9)
        LE Address: 01:70:5A:6F:6D:8E (OUI 01-70-5A)
        Min connection interval: 25
        Max connection interval: 25
        Connection latency: 0 (0x0000)
        Supervision timeout: 600
< ACL Data TX: Handle 3585 flags 0x00 dlen 10                                                                                           #17 [hci0] 2.474019
      LE L2CAP: Connection Parameter Update Response (0x13) ident 96 len 2
        Result: Connection Parameters accepted (0x0000)
< HCI Command: LE Connection Update (0x08|0x0013) plen 14                                                                               #18 [hci0] 2.474022
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Min connection interval: 31.25 msec (0x0019)
        Max connection interval: 31.25 msec (0x0019)
        Connection latency: 0 (0x0000)
        Supervision timeout: 6000 msec (0x0258)
        Min connection length: 0.000 msec (0x0000)
        Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4                                                                                               #19 [hci0] 2.474964
      LE Connection Update (0x08|0x0013) ncmd 1
        Status: Success (0x00)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 7                                                                          #20 [hci0] 2.480912
      ATT: Exchange MTU Request (0x02) len 2
        Client RX MTU: 517
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #21 [hci0] 2.504982
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #16: len 11 (2 Kb/s)
        Latency: 30 msec (30-30 msec ~30 msec)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #22 [hci0] 2.505981
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #17: len 10 (2 Kb/s)
        Latency: 31 msec (30-31 msec ~31 msec)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #23 [hci0] 2.506981
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #20: len 7 (2 Kb/s)
        Latency: 26 msec (26-31 msec ~28 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 7                                                                                            #24 [hci0] 2.538782
      ATT: Exchange MTU Response (0x03) len 2
        Server RX MTU: 512
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #25 [hci0] 2.539152
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0xffff
        Attribute type: Server Supported Features (0x2b3a)
> HCI Event: LE Meta Event (0x3e) plen 11                                                                                               #26 [hci0] 2.567998
      LE Data Length Change (0x07)
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Max TX octets: 251
        Max TX time: 2120
        Max RX octets: 251
        Max RX time: 2120
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #27 [hci0] 2.568957
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #25: len 11 (3 Kb/s)
        Latency: 29 msec (26-31 msec ~29 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 9                                                                                            #28 [hci0] 2.599762
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0001
        Error: Attribute Not Found (0x0a)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #29 [hci0] 2.599895
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0001-0xffff
        Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #30 [hci0] 2.630960
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #29: len 11 (2 Kb/s)
        Latency: 31 msec (26-31 msec ~30 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 24                                                                                           #31 [hci0] 2.662760
      ATT: Read By Group Type Response (0x11) len 19
        Attribute data length: 6
        Attribute group list: 3 entries
        Handle range: 0x0001-0x0005
        UUID: Generic Access Profile (0x1800)
        Handle range: 0x0006-0x0009
        UUID: Generic Attribute Profile (0x1801)
        Handle range: 0x000a-0x0011
        UUID: Aplix Corporation (0xfef8)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #32 [hci0] 2.662937
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0012-0xffff
        Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #33 [hci0] 2.691931
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #32: len 11 (3 Kb/s)
        Latency: 28 msec (26-31 msec ~29 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 46                                                                                           #34 [hci0] 2.724762
      ATT: Read By Group Type Response (0x11) len 41
        Attribute data length: 20
        Attribute group list: 2 entries
        Handle range: 0x0012-0x0015
        UUID: Vendor specific (66666666-6666-6666-6666-666666666666)
        Handle range: 0x0016-0x0019
        UUID: Vendor specific (86868686-8686-8686-8686-868686868686)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #35 [hci0] 2.724888
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x001a-0xffff
        Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #36 [hci0] 2.754935
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #35: len 11 (2 Kb/s)
        Latency: 30 msec (26-31 msec ~29 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 9                                                                                            #37 [hci0] 2.786761
      ATT: Error Response (0x01) len 4
        Read By Group Type Request (0x10)
        Handle: 0x001a
        Error: Attribute Not Found (0x0a)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #38 [hci0] 2.786911
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0001-0xffff
        Attribute group type: Secondary Service (0x2801)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #39 [hci0] 2.816964
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #38: len 11 (2 Kb/s)
        Latency: 30 msec (26-31 msec ~29 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 9                                                                                            #40 [hci0] 2.849804
      ATT: Error Response (0x01) len 4
        Read By Group Type Request (0x10)
        Handle: 0x0001
        Error: Attribute Not Found (0x0a)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #41 [hci0] 2.849913
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0x0019
        Attribute type: Include (0x2802)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #42 [hci0] 2.879984
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #41: len 11 (2 Kb/s)
        Latency: 30 msec (26-31 msec ~30 msec)
> HCI Event: LE Meta Event (0x3e) plen 10                                                                                               #43 [hci0] 2.880985
      LE Connection Update Complete (0x03)
        Status: Success (0x00)
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Connection interval: 31.25 msec (0x0019)
        Connection latency: 0 (0x0000)
        Supervision timeout: 6000 msec (0x0258)
> ACL Data RX: Handle 3585 flags 0x02 dlen 9                                                                                            #44 [hci0] 2.911782
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0001
        Error: Attribute Not Found (0x0a)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #45 [hci0] 2.912138
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0x0019
        Attribute type: Characteristic (0x2803)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #46 [hci0] 2.942986
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #45: len 11 (2 Kb/s)
        Latency: 30 msec (26-31 msec ~30 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 41                                                                                           #47 [hci0] 2.974828
      ATT: Read By Type Response (0x09) len 36
        Attribute data length: 7
        Attribute data list: 5 entries
        Handle: 0x0002
        Value[5]: 020300002a
            Properties: 0x02
              Read (0x02)
            Value Handle: 0x0003
            Value UUID: Device Name (0x2a00)
        Handle: 0x0004
        Value[5]: 020500012a
            Properties: 0x02
              Read (0x02)
            Value Handle: 0x0005
            Value UUID: Appearance (0x2a01)
        Handle: 0x0007
        Value[5]: 220800052a
            Properties: 0x22
              Read (0x02)
              Indicate (0x20)
            Value Handle: 0x0008
            Value UUID: Service Changed (0x2a05)
        Handle: 0x000b
        Value[5]: 100c000414
            Properties: 0x10
              Notify (0x10)
            Value Handle: 0x000c
            Value UUID: Unknown (0x1404)
        Handle: 0x000f
        Value[5]: 0c10003107
            Properties: 0x0c
              Write Without Response (0x04)
              Write (0x08)
            Value Handle: 0x0010
            Value UUID: Unknown (0x0731)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #48 [hci0] 2.975200
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0010-0x0019
        Attribute type: Characteristic (0x2803)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #49 [hci0] 3.004983
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #48: len 11 (3 Kb/s)
        Latency: 29 msec (26-31 msec ~30 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 48                                                                                           #50 [hci0] 3.037830
      ATT: Read By Type Response (0x09) len 43
        Attribute data length: 21
        Attribute data list: 2 entries
        Handle: 0x0013
        Value[19]: 18140077777777777777777777777777777777
            Properties: 0x18
              Write (0x08)
              Notify (0x10)
            Value Handle: 0x0014
            Value UUID: Vendor specific (77777777-7777-7777-7777-777777777777)
        Handle: 0x0017
        Value[19]: 18180097979797979797979797979797979797
            Properties: 0x18
              Write (0x08)
              Notify (0x10)
            Value Handle: 0x0018
            Value UUID: Vendor specific (97979797-9797-9797-9797-979797979797)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 11                                                                         #51 [hci0] 3.038189
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0018-0x0019
        Attribute type: Characteristic (0x2803)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #52 [hci0] 3.067001
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #51: len 11 (3 Kb/s)
        Latency: 28 msec (26-31 msec ~29 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 9                                                                                            #53 [hci0] 3.099819
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0018
        Error: Attribute Not Found (0x0a)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 9                                                                          #54 [hci0] 3.100260
      ATT: Find Information Request (0x04) len 4
        Handle range: 0x000d-0x000e
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #55 [hci0] 3.129986
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #54: len 9 (2 Kb/s)
        Latency: 29 msec (26-31 msec ~29 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 14                                                                                           #56 [hci0] 3.161855
      ATT: Find Information Response (0x05) len 9
        Format: UUID-16 (0x01)
        Handle: 0x000d
        UUID: Client Characteristic Configuration (0x2902)
        Handle: 0x000e
        UUID: Characteristic User Description (0x2901)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 9                                                                          #57 [hci0] 3.162236
      ATT: Find Information Request (0x04) len 4
        Handle range: 0x0011-0x0011
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #58 [hci0] 3.223986
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #57: len 9 (1 Kb/s)
        Latency: 61 msec (26-61 msec ~45 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 10                                                                                           #59 [hci0] 3.286830
      ATT: Find Information Response (0x05) len 5
        Format: UUID-16 (0x01)
        Handle: 0x0011
        UUID: Characteristic User Description (0x2901)
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 9                                                                          #60 [hci0] 3.296554
      ATT: Write Request (0x12) len 4
        Handle: 0x0009 Type: Client Characteristic Configuration (0x2902)
        Value Handle: 0x0008 Type: Service Changed (0x2a05)
          Data[2]: 0200
            Indication (0x02)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #61 [hci0] 3.316932
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #60: len 9 (3 Kb/s)
        Latency: 20 msec (20-61 msec ~33 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 5                                                                                            #62 [hci0] 3.349796
      ATT: Write Response (0x13) len 0
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 7                                                                          #63 [hci0] 3.349961
      ATT: Read Request (0x0a) len 2
        Handle: 0x0003 Type: Device Name (0x2a00)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #64 [hci0] 3.380028
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #63: len 7 (1 Kb/s)
        Latency: 30 msec (20-61 msec ~31 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 21                                                                                           #65 [hci0] 3.412821
      ATT: Read Response (0x0b) len 16
        Value[16]: 45617246756e20576176652050726f00
        Handle: 0x0003 Type: Device Name (0x2a00)
        Value[16]: 45617246756e20576176652050726f00
bluetoothd[1273]: < ACL Data TX: Handle 3585 flags 0x00 dlen 7                                                                          #66 [hci0] 3.413026
      ATT: Read Request (0x0a) len 2
        Handle: 0x0005 Type: Appearance (0x2a01)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                  #67 [hci0] 3.441985
        Num handles: 1
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Count: 1
        #66: len 7 (2 Kb/s)
        Latency: 28 msec (20-61 msec ~30 msec)
> ACL Data RX: Handle 3585 flags 0x02 dlen 7                                                                                            #68 [hci0] 3.474830
      ATT: Read Response (0x0b) len 2
        Value[2]: 0000
        Handle: 0x0005 Type: Appearance (0x2a01)
        Value[2]: 0000
< HCI Command: Disconnect (0x01|0x0006) plen 3                                                                                         #69 [hci0] 32.738951
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4                                                                                              #70 [hci0] 32.836890
      Disconnect (0x01|0x0006) ncmd 1
        Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4                                                                                         #71 [hci0] 32.849881
        Status: Success (0x00)
        Handle: 3585 Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Reason: Connection Terminated By Local Host (0x16)
@ MGMT Event: Device Disconnected (0x000c) plen 8                                                                                 {0x0001} [hci0] 32.849919
        LE Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)
        Reason: Connection terminated by local host (0x02)
@ MGMT Event: Command Complete (0x0001) plen 10                                                                                   {0x0001} [hci0] 32.849926
      Pair Device (0x0019) plen 7
        Status: Failed (0x03)
        LE Address: 70:5A:6F:6D:8E:B9 (OUI 70-5A-6F)

Make sure it’s not connected to anything else when you try (i.e., explicitly disable bluetooth on any phones or TVs or whatever else it’s paired to; modern headsets like absolutely broadcasting reconnects).

A weird quirk of most headsets is that they can only connect to two devices at a time. IME this Schrödinger connection is what you get if you exceed that.

Have confirmed that it is not connected to anything else. It plays a noise after turning on that says “Pairing” when it hasn’t connected.