If the user name is defined on an authentication service and you want to use that service for SVC authentication, you must configure the SVC to use that authentication service.
Ensure that you are using the correct user name.
If the user name is not configured on the SVC and you want to use the SVC to authenticate, create a new user with the user name that you want to use on the SVC.
If the user name is defined on an authentication service and you want to use that service for SVC authentication, configure the SVC to use that authentication service.
Resubmit the task.