Just added my Yubikey to my Microsoft Account URL "Passwordless Account" ON. But I don't get prompted for "Touch the USB" :-( I'm only offered PIN or Password after I've locked the PC. Is there something else I have to do? Another setting?
You cannot currently use a FIDO2 security key for sign in to Windows with a Microsoft consumer account.
The link posted in the comment is for AAD (work/school accounts).