Hm. As was discussed here a few months ago, even “older” keys should be usable for Bitwarden’s FIDO2-2FA… But how old is your (failing) key - or which model is it?
Given it is a model that should still work, on first notice it looks like it might be defect. (again one caveat: you didn’t change some configurational things for the key, like deactivating some or all USB/NFC “interfaces” (in particular the FIDO/FIDO2 protocols)?! → like you can see here: Passkey Two-Step Login | Bitwarden)