I've never used passkeys before so might just be my ignorance. I've added a passkey to my account and it's saved in Bitwarden but I don't see an option to use it. The login page asks for a username / password and then below the login button says "or use a username and password:". Am I doing something wrong?

Secondary question, from what I can tell Piefed only supports passkeys and not authenticator-based 2FA, is that accurate?

Yes they are not completly implemented yet.

Sounds good. Thanks.

there used to be a button, it seems it got lost with some recent auth related changes. it's not 2FA though, only a replacement for passwords at this time.

reported in https://codeberg.org/rimu/pyfedi/issues/1068

passkeys are working again