Assign Task API is not working

@bpmnenthusiast and @Mukesh_Reddy - I believe we’ve found the missing configs! It was quite a journey, but a good one for us to take as we’ve identified important gaps in our documentation and default configurations. Thanks for the patience and the feedback!

Add these variables to the Zeebe configuration in docker-compose.yaml:

- CAMUNDA_IDENTITY_ISSUERBACKENDURL=http://keycloak:8080/auth/realms/camunda-platform
- CAMUNDA_IDENTITY_BASEURL=http://identity:8084
- CAMUNDA_IDENTITY_AUDIENCE=zeebe-api
- SPRING_PROFILES_ACTIVE=identity-auth

I think these can replace some of the variables, but I am not totally sure, so best leave the other configuration values as is for now.

Let me know if this works for you!