Webauthn-authenticator-passwordless fails

Hi there,

i have followed the guide to setup passwordless registration and login. I can successfull register a user with Yubikey 5 and i can see the webauthn credentials of the user in Admin console.

But when i try to login the user i get

04:57:50,100 WARN  [org.keycloak.services] (default task-17) KC-SERVICES0013: Failed authentication: org.keycloak.authentication.AuthenticationFlowException: authenticator: webauthn-authenticator-passwordless
    at org.keycloak.authentication.DefaultAuthenticationFlow.processSingleFlowExecutionModel(DefaultAuthenticationFlow.java:438)
    at org.keycloak.authentication.DefaultAuthenticationFlow.processFlow(DefaultAuthenticationFlow.java:252)
    at org.keycloak.authentication.DefaultAuthenticationFlow.processSingleFlowExecutionModel(DefaultAuthenticationFlow.java:386)
    at org.keycloak.authentication.DefaultAuthenticationFlow.processFlow(DefaultAuthenticationFlow.java:252)
    at org.keycloak.authentication.DefaultAuthenticationFlow.processSingleFlowExecutionModel(DefaultAuthenticationFlow.java:386)
    at org.keycloak.authentication.DefaultAuthenticationFlow.continueAuthenticationAfterSuccessfulAction(DefaultAuthenticationFlow.java:185)
    at org.keycloak.authentication.DefaultAuthenticationFlow.processAction(DefaultAuthenticationFlow.java:163)
    at org.keycloak.authentication.AuthenticationProcessor.authenticationAction(AuthenticationProcessor.java:938)
    at org.keycloak.services.resources.LoginActionsService.processFlow(LoginActionsService.java:311)
    at org.keycloak.services.resources.LoginActionsService.processAuthentication(LoginActionsService.java:282)
    at org.keycloak.services.resources.LoginActionsService.authenticate(LoginActionsService.java:266)
    at org.keycloak.services.resources.LoginActionsService.authenticateForm(LoginActionsService.java:339)