Trouble adding a tenant

[Dustytome]

Have your friend double check to make sure they're not the tenant of other private homes. You can be set to tenant by others without your consent as long as you're on each others friends list. Also make sure you both have each other on your friends list. If one person removes another from the friends list, the system doesn't adjust things on the other side of the fence. You may also consider removing each other from your friends lists and then adding each other again to see if that alleviates the issue. Also make sure your friend isn't using world visit at the time (don't know if that would cause an issue, but throwing it out there). If none of that works, you may need to contact a GM in game to sort out the issue.

Appreciate the effort, but no, they do not own any houses nor are they tenants anywhere.

It's a very odd situation and I attempted sending a support ticket because it seems like something is wrong but as you can imagine I only got a generic automated response telling me ways to find a solution. I haven't seen or heard of this problem in my search so far.

Keep trying to contact a GM until someone actually responds then. It can take awhile to get around canned responses.