How do I remove a door sensor I do not have access to?

I have a door sensor that stopped responding. I took it down in the middle of remodeling the house, and want to remove it from my ring alarm, but the system insists that I have access to the working sensor to be able to remove it. Surely there is a way to remove it, so that I don’t have to bypass it every time I arm the alarm. My parents haven’t got the Ring app installed on their phones and try to arm with the keypad but are not successful. I just want it deleted. There has to be another way short of factory resetting the keypad and then pairing all the devices again, and not sure that would even work.