Oauth login error are not logged
If you have an error when login with OIDC/Oauth2, that the login is correct on the IdP, but that rudder does not know the user (missing from
rudder-user.xml for ex), then you get a blank "401 unauthorized" page in place of rudder login page:
Moreover, the login error is only logged at TRACE level:
[2022-04-25 12:24:23+0200] TRACE org.springframework.security.oauth2.client.web.OAuth2LoginAuthenticationFilter - Failed to process authentication request bootstrap.liftweb.RudderProviderManager$1: User with username 'firstname.lastname@example.org' was not found
The display part may need an adaptation between 6.2 and 7.x, even if the backend will likely be the same.