Hi. We have a SQL 2012 SSRS instance. We need to modify the permissions on one of the reporting folders. I went to the Security setting of the folder, clicked "New role assignment", then entered a group name into the box and selected desired permission ("Browser" in this case).
However this always fails with the same error: "The user or group name 'BUILTIN\BUILTIN' is not recognized. (rsUnknownUserName)"
I always get the same error no matter if I enter user or group, domain or local. And it always says BUILTIN\BUILTIN. I've tried changing the SSRS service account to a domain account (it was a local one), but that didn't help.
Any help is appreciated.