Thanks for your answers. We have our on premise Keycloak with the OpenID. How compatible it is to enable “Authentication via Generic OAuth2” with Keycloak OpenID for enabling SSO?
I tried it, and it is successfully enabling “OAuth2” button in the login page, but login redirection is failed with “Invalid parameter: redirect_uri”. Anyone had an experience to enable Keycloak OpenID with Zammad “Generic OAuth2”.