Bitwarden login with passkey only works in the webapp though, not the browser extension, desktop app or mobile app.

I’m confused by this — I use passkeys stored in Bitwarden and they work fine in the browser extension and mobile app (I don’t use the desktop app often so IDK). Are there particular sites that it doesn’t work with?

I think they mean logging into Bitwarden with a physical passkey.

I mean logging into the bitwarden account with the yubikey. Passkeys stored in bitwarden are usually accepted

Bitwarden login with passkey only works in the webapp though, not the browser extension, desktop app or mobile app.

Can’t confirm, my yubikey is my 2nd factor for bitwarden and I login with it on both my phone and web browsers

It works as second factor, yes. It does for many services, but using it for actually passwordless passkey login doesn’t work for most services with my yubikey.