[keycloak-user] Login after registration fails when other user was logged in before

Hi, we encountered a problem in a special use case (Keycloak 4.5.0.Final): We'd like to display a registration button in our application even when a user (user1) is logged in. Directly calling the registration form seems to be supported according to http://lists.jboss.org/pipermail/keycloak-user/2016-August/007473.html However, the login after the registration (of user2) fails when user1 was logged in before. The problem can be reproduced by following these steps: 1. Log user1 into the account app 2. Open the registration form at https://<host>/auth/realms/<realm>/protocol/openid-connect/registrations?client_id=account&response_type=code&scope=openid+email&redirect_uri=<url_to_account_app> 3. Register user2 4. After registration, this message is shown: "We're sorry... You are already authenticated as different user <user1> in this session. Please logout first." The message contains a link "Back to Application". However, user1 is not logged in anymore and the link "Back to Application" leads to the login form. This situation is not straightforward for a user to resolve: user1 has to log in again, then log out, and only then is user2 able to log in. The reason appears to be that opening the registration form in step 2 deletes the cookies KEYCLOAK_IDENTITY and KEYCLOAK_SESSION. However, the cookie AUTH_SESSION_ID remains unchanged. To me it seems that opening the registration form should cause a new AUTH_SESSION_ID to be generated (beside KEYCLOAK_IDENTITY and KEYCLOAK_SESSION being cleared). I'd appreciate any thoughts on that! Best regards, Marian