That actually works too. The PC shows a QR code you scan with your phone which negotiates the login. Doesn't require signing in with anything on the PC first.
I do this with my work laptop where the passkeys are stored on my personal phone.
I do this with my work laptop where the passkeys are stored on my personal phone.
Background: the Entra login used to work fine with password + MS Athenticator notification, but recently it forced me to set up a passkey using MS Authenticator (on my phone)... which was all well and good, except that there's no way for me to actually pass the passkey to Entra, so I end up clicking things multiple times (login using other means, selecting password, selecting how I wish to MFA, selecting Authenticator notification etc).. All it did was significantly increase my login times and fallback to password logins.
So I'm not sure how I'm supposed to log in with the passkey, there's no QR code or anything.
This is why passkey are a failure, no one knows how they work, and even one someone claims they know, the reality is often different.
If you try to sign in with passkeys but there are none found on the local machine it will ask if you want to use a usb auth or QR code scan.