I want to achieve a truly login-less WebAuthn Authentication, i.e. no input of password NOR username, like in docu.
I know that this only works with specific security keys (i.e. the ones which can store the username), but in the docu, it says that it should work with Windows Hello.

However, when using the LoginLess flow of the docu, i.e. the flow onsists only of "WebAuthn Passwordless Authenticator", see "LoginLess flow", I only get this error message when logging in: "We are sorry... Invalid username or password".

Note, the login, using Windows Hello as security key, works when adding "Username Form" to the flow. But I don't want to type in my username, because Keycloak should detect it automatically (because it is stored on the security key).

Can anyone help me? Here they state, that a loginless authentication has been successfully tested with Windows Hello.

PS: I also created a stackoverflow question. And it is also quite similar to the problem of @nicolas-nunca in #11488.