Amending a return, stuck at "Correct your payment date"

Screenshot from 2023-03-26 18-06-43.png

 

I owe some more money. Happy to pay it, but the system won't accept dates in 2022 or 2023, so I'm stuck in an endless loop of trying to 'fix' my return. I talked to TT Live, but they couldn't figure it out and suggested I print and file by mail. I really don't want to go through that, and I can't figure out why TT wouldn't be able to handle this very common situation