So I made a perfect, separate place for my future roomies. I made sure they had EVERYTHING. My Sim is a freegan/fabricator/maker etc. so she made or dumpster dove every single item that is available a...
If the new roommates aren't having issues and can access everything, then maybe it was just a glitch. Glitches happen quite often. Usually a game restart helps with those.
I'm glad you got it all sorted out. Enjoy your new roommates. ?