ERROR 401 User is not registered on the reporting server.

Document ID : KB000112232
Last Modified Date : 27/08/2018
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Issue:
I'm getting an "ERROR 401 User is not registered on the reporting server" message when I try to access Advanced Reporting. I have cleared my cache and nothing seems to help. 
Resolution:
Ran the Create & Update Jaspersoft Users Job and the problem was resolved.