TFS 2013 TfsReports on SQL Server 2014 - rsAccessDenied Error even though all users are granted ALL Roles

Question

We have granted everyone all roles on our TfsReports site. However, all users (except for 2 who are TFS Admins) still get the following errors when attempting to manage the reports:
The permissions granted to user Domain\UserName are insufficient for performing this operation. (rsAccessDenied)
These are the roles we've granted to all "Domain Users": Browser, Content Manager, My Reports, Publisher, Report Builder, Team Foundation Content Manager.
We can't seem to figure out what else might be missing.
Please help.

Answer 1

The issue was reported by one of the Application Support team stating that they have problems with accessing reports in Reporting Services from Team Foundation Server (TFS)
side. By default certain users are part of local domain group having LOCAL ADMINISTRATOR privileges on TFS server, which is by default no issues for those users. Somehow there was a change in the role of certain users where ADMIN access was revoked. However
the users are still part of SYSADMIN group, they were reported the error as follows:
“The
permissions granted to user ''DOMAIN\UserName'' are insufficient for performing this operation. (rsAccessDenied)”
By default the text clarifies that no permission to access the reports and further we have set of roles defined on the Reporting
Services, as follows: 
http ://servername/Reports/
Root
BUILTIN\Administrators                  No
access
DOMAIN\TfsAdmins                        Content
Manager
DOMAIN\ReportAdmins
     Content Manager
More
details
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