[keycloak-user] Restrict the user creation of from IDP.

Hi, My requirement is that only pre-created user, when logged in via Identity Broker, should be automatically linked to its IDP user. If other user gets logged in then it should throw an error and stop the Authentication Flow. My requirement is similar to that mention on https://issues.jboss.org/browse/KEYCLOAK-4544 As the above issue is deferred I still need to get a solution for my requirement. Can you suggest me any solution? Or the path to contribute? As mentioned in above Jira ticket in the comment of Robert, I would like to add configuration and modify IdpCreateUserIfUniqueAuthenticator, so that if a nonexisting user logs in via IDP then it should throw an error. Thank You Rohit Nikhade (+91) 8793652775