AX 2012 SSRS error (rsAccessDenied)

Error while setting server report parameters. Error message: The permissions granted to user 'DOMAIN\user' are insufficient for performing this operation. (rsAccessDenied)

This is a well documented error [1], [2] but this happens all of the time.

1. Open IE on the Reporting Server, with Run as Administator…
2. Lets go to http://localhost/reports

3. Select the DynamicsAx installation folder, then Properties, New Role Assignment

Add your AX domain user group or user

4. Check all the checkboxes; Browser, Dynamics Ax Browser, Content Manager, My Reports, Publisher, Report Builder.  This is for a development profile.  Be more restrictive for the production environment.
Click OK.

Format: DOMAIN\AXUserGroup

We now have the users added, and there is no need to restart the services to see the changes.