@Ted ********
When I moved into my condo the owner didn’t do it either. I sent a group Line to him & my agent less than a week after moving in about it.
My agent ended up doing it & my subsequent ones as well.
When I went for my Certificate of Residence for my Thai DL, the IO officer questioned me about the lapse in time between my hotel rental & reported TM30 date. She was nice & didn’t penalize me but mentioned the fines & potential issues going forward.
Go back to immigration, be polite, dressed nicer than most Farangs (it’s a government office after all) & you might get a good officer.
Good luck.