Authorization decision get ignored

Hi,
I have create an authorization policy for an OpenID client.
When I use the “Evaluate” function to test it, I see the right results (Deny/Allow).
But the end user are always logged into the application which is using Keycloak.
So it looks like, that the decision of the authorization rules are not applied.

I using Keycloak 21.0.1

Is it an bug or do I something wrong?

Solved, the app (client) was not UMA2 aware.