Ring App Used to Answer Ring Doorbell Pro But Now Doesn't

Our Ring Pro used to work just fine for answering the doorbell or for Live View.

Currently Live View comes up in 4 seconds but answering the doorbell when someone presses the button never works - we see the spinning icon as my iPhone tries to display the image but that’s all that happens.

The Ring Pro is connected to our mechanical doorbell (with the small circuitboard and wiring) in a house built in 1951 which likely has the original doorbell transformer but its location remains a mystery.

RSSI is -44

Voltage is 4040mv

MAC is 44:39:C4: DA:F4:3E

Any advice you might have would be deeply appreciated.