The following issue might happen when installing SCOM 2016 reporting on a SQL 2016 server and trying to access the SSRS report server URL with a non SCOM administrator user (but which has admin rights on SSRS level): "Could not load folder contents. You are not allowed to view this folder. Contact your administrator to obtain the necessary permissions"
The reports however are viewable in the SCOM console so the AccessDeniedException occurs on SQL level only.
This error will be fixed with SQL16 SP1 CU8.