This appears to work, going to do some testing with this in the configuration.nix
https://github.com/clearlinux/distribution/issues/2284#issuecomment-1073953007
env WEBKIT_FORCE_SANDBOX=0 gnome-control-center online-accounts
At the moment, I’m not sure why, but I think it has to do with assumed paths which don’t exist with NixOS’s FS structure.