[keycloak-user] User registration with eMail-address already in use shows internalServerError

Dear keycloak-users, I'm not sure if I'm doing something wrong or if it is by design, but I get an 'internalServerError'-message when I'm trying to register a new user with an email-address that is already in use by another Keycloak-user. -Realm-Settings: Email as username: Off Verify email: On Login with email: Off Duplicate email: Off -Keycloak version: 4.8.3.Final -Database: Postgres With Keycloak 3.4.3.Final I was faced with the same issue, but received a different error message. Any pointers would be greatly appreciated! Best, Rajib