Some time ago, I was working on a request to limit access to a folder to members of four AD groups. Following the established practice at my employer, I created the group to grant access to the folder, and the one to control who has access. I made the latter a member of the former, and went to add the members. Two of the AD groups that were to have access were added, no problem. The other two were not. Not only that, I couldn’t even find them when searching for them,