Hi, Apologies if this email is incorrectly posted. I'm using the newly released Keycloak 4 and I've been able to successfully get an access token for a user from an access code posted back to my application. This doesn't contain any permissions on the token (Rightly so, only roles) I'm now trying to get an RPT with permissions from the of client application that reflect what the User is allowed to do. My request looks something like: POST /auth/realms/MyRealm/protocol/openid-connect/token HTTP/1.1 Host: localhost:8080 Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5c ... Content-Type: application/x-www-form-urlencoded Cache-Control: no-cache Postman-Token: 4054feaf-a9d7-48e2-99b6-eabc86bf8da5 grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Auma-ticket&audience=MyClient&permission=Default+Resource Where the Bearer is the generated access_token. However I'me getting a response of : 500 Internal Server Error { "error": "server_error", "error_description": "Unexpected error while evaluating permissions" } And a stack trace of: Unexpected error while evaluating permissions: java.lang.RuntimeException: Error while reading attributes from security token. at org.keycloak.authorization.common.KeycloakIdentity.<init>(KeycloakIdentity.java:139) at org.keycloak.authorization.common.KeycloakIdentity.<init>(KeycloakIdentity.java:68) at org.keycloak.authorization.authorization.AuthorizationTokenService.lambda$static$1(AuthorizationTokenService.java:124) at org.keycloak.authorization.authorization.AuthorizationTokenService.createEvaluationContext(AuthorizationTokenService.java:311) at org.keycloak.authorization.authorization.AuthorizationTokenService.authorize(AuthorizationTokenService.java:161) at org.keycloak.protocol.oidc.endpoints.TokenEndpoint.permissionGrant(TokenEndpoint.java:1124) at org.keycloak.protocol.oidc.endpoints.TokenEndpoint.processGrantRequest(TokenEndpoint.java:190) ..... Caused by: java.lang.NullPointerException at org.keycloak.services.util.DefaultClientSessionContext.fromClientSessionScopeParameter(DefaultClientSessionContext.java:64) at org.keycloak.authorization.common.KeycloakIdentity.<init>(KeycloakIdentity.java:123) Any Ideas what I may be doing wrong? Any help appreciated. Regards, Mark