Failed to load /etc/ssl/certs/ca-bundle.crt

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Hello guys!

I’m currently trying to connect to my wlan with iwctl.
This is in my /var/lib/iwd/KIT.8021x:

[Security]
EAP-Method=TTLS
EAP-Identity=anonymous@kit.edu
EAP-TTLS-CACert=/etc/ssl/certs/ca-bundle.crt
EAP-TTLS-ServerDomainMask=radius-wlan.scc.kit.edu
EAP-TTLS-Phase2-Method=Tunneled-PAP
EAP-TTLS-Phase2-Identity=<my-identity>
EAP-TTLS-Phase2-Password=<my password>

[Settings]
AutoConnect=true

but iwctl gives me the Not configured, if I try to connect to it.
Also sudo systemctl status iwd gives me the following error message:

Jun 21 10:36:50 laptop iwd[10238]: Failed to load /etc/ssl/certs/ca-bundle.crt
Jun 21 10:36:50 laptop iwd[10238]: Failed to load /etc/ssl/certs/ca-bundle.crt
Jun 21 10:36:50 laptop iwd[10238]: Failed to load /etc/ssl/certs/ca-bundle.crt
Jun 21 10:36:51 laptop iwd[10238]: Failed to load /etc/ssl/certs/ca-bundle.crt
Jun 21 10:36:51 laptop iwd[10238]: Failed to load /etc/ssl/certs/ca-bundle.crt
Jun 21 10:36:51 laptop iwd[10238]: Failed to load /etc/ssl/certs/ca-bundle.crt

I checked the permissions with ls -l /etc/ssl/certs/ca-bundle.crt:

lrwxrwxrwx 89 root  1 Jan  1970  ca-bundle.crt -> /nix/store/vhxra51ldzd1418pagydlrhd195bs1vf-nss-cacert-3.89.1/etc/ssl/certs/ca-bundle.crt
lrwxrwxrwx 89 root  1 Jan  1970  ca-certificates.crt -> /nix/store/vhxra51ldzd1418pagydlrhd195bs1vf-nss-cacert-3.89.1/etc/ssl/certs/ca-bundle.crt

What am I doing wrong?