[keycloak-user] Restreint access to a client with role

[Emeline CHEVALIER]

Hi,
I have realm with many clients. I want to restraint access to one client for users that not have a role.
Example :
MyRealm with Client A access to a server A and Client B to access to a server B (SAML configuration).
I have many users but I want that only users with role "AccessB" must to access to my server B.
How to do that ?
I try to create roles, policies... but I'm lost into these configurations.

Keycloak version : 3.4

Regards

Emeline