AuthHub does not verify the identity when Identity Provider Discovery is enabled and no error message is displayed.
VIP Authentication Hub 3.2.1
The user is verified, but the error message is hidden if 'Hide authentication failure reason' is enabled in the user settings.
Hide Authentication Failure Reason: Toggle this option to disclose or hide the complete error message when an invalid user/locked user tries to start the authentication flow.
For more information, please refer the section User Settings from product documentation.