camunda-platform-7-keycloak: Always got 403 at Camunda startup

Hi,

I’m not able to use your PlugIn. At startup of my application I got following exception:

Caused by: org.springframework.web.client.HttpClientErrorException$Forbidden: 403 Forbidden at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:83) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:123) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:102) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:785) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:743) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:677) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:586) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE] at org.camunda.bpm.extension.keycloak.KeycloakIdentityProviderSession.getKeycloakAdminGroupId(KeycloakIdentityProviderSession.java:1043) ~[camunda-bpm-identity-keycloak-1.5.0.jar:1.5.0] ... 38 common frames omitted

I have an existing Keycloak server and added a new client and the admin group in my realm with all the settings out of the documentation. It seems that the login success but the request for the admin group fails.

Is there something to change in Keycloak what is missing in the documentation?

Best regards