Error 401 - User Not Registered.
Error User is not registered on the reporting server.
You (or the impacted user) do not exist on the JasperReports Server, but the Clarity database shows that your status is synchronized to the JasperReports Server.
This situation can occur after the integration when your user is deleted in JasperReports Server.
Run the Create and Update Jaspersoft Users job with the 'Include Inactive and Locked Users' option checked.
If the above does not help, see also: