Custom dorms not listed while enrolling into university

Last night I placed a lot from the Gallery into the Briny Tower or whatever it is called, and when I went to enroll in Uni it wasn't there either. I cancelled and went back to the lot, made sure all the lot requirements were met, and added the (for some reason) optional outdoor trashcan.

Went back into my household and started the enrollment process again and the dorm was there! Not sure if that will help you too, but that seemed to fix my issue.