How to configure SLO (Single LogOut) service?

Now, I’m building a SSO - single sign on /SLO (single sign out) service on the Rancher with the Keycloak.

Current problem is the SLO service.

  1. Login as “test_user” account by clicking “Log in with keycloak” from Rancher UI.
  2. Logout (“test_user” account) from Rancher UI.
  3. Again login as “test_user” account.
    → In this time the login is processed without any login id/password form UI.

I inteded to be single signed out the account on step 2.
Actually, I confirmed that the “test_user” session is alive into keycloak server.
How can I clear the session information?

Thanks.

I found similar issue.