Passkey Cross-device Authentication (CDA) device support:
Good link – thanks.
According to the matrix in that link, passkey CDA for Bitwarden ‘login with passkey on another device’ from:
- Windows ( v23H2+) client to Android (v9+) authenticator is supported by FIDO2 standards - but does not work for me on my Samsung S7 (Android 9) or S10+ (Android 12)
- Android client (planned) to Windows authenticator (N/A) is not supported.
.
My understanding is that Cross-Device Authentication is a general term which may, or may not, employ passkeys.
Microsoft’s number matching from PC to the Microsoft Authenticator app on a phone is a form of non-passkey CDA.
Bitwarden’s non-passkey fingerprint CDA works even on my old devices where passkey CDA does not:
Bw-admin post: “Have you tried out the new Login with Device functionality?”
https://community.bitwarden.com/t/have-you-tried-out-the-new-login-with-device-functionality/
The FIDO alliance uses the term ‘CDA’ only in the context of passkey CDA, because that is their focus.
.
A source of confusion is that Bitwarden have two ‘login with device’ CDA methods:
- Non-passkey, using fingerprint phrases.
- Passkey, using passkeys.