How to put own roommates in University Housing?

I am scratching my head trying to figure this out.

I enrolled everybody I wanted to live together to Foxbury (which was a hassle in itself), and moved one of them in so I could ask the rest to be roommates. I deleted every random NPC roommate so there would be available spots, but I can't find the proper interaction to move anyone in as roommates.

I've tried finding the interaction to ask for roommates on both phone and computer also.

Is it even possible to have your own roommates in University Housing? Or is it just in residential?