Update!
After installing a shutoff valve in-line, and using the toilet several times both with use and cleaning, the toilet is now working. We still do use the shutoff valve that i installed for safe measure, though. It was a 5 minute install and 10$ job that ensures we have manual control over the toilet!
Its a 1/2"OD brass ball valve - I cut the supply line, put a couple 1" hose clamps on, tightened it down, and boom!