CMMVC6554E The Authentication task has failed because the user name that was received from the authentication service is not a valid cluster user name.

Explanation
The cluster user name cannot exceed 256 characters
in length, and cannot contain any of the following characters:

colon :

percent sign %

comma ,

double quote

single quote '

User response
Change the definition of the user name in the
remote authentication service so that it conforms to the cluster user
name requirements, and resubmit the task.