“I had same problem last week after a restart. My bell is mechanical. What fixed it for me was selecting the bell type “Electronic” in the Nest App (with a longer chime), then pressing the doorbell. It worked, then I switched it back to mechanical and it's been fine since.

raheenb75”

This worked for me, I had accidentally shorted the wires. The mechanical chime would only “dong” and not every ring. Camera and everything else worked fine but chime would not “ding dong”. I set it to electronic chime rang it a few times, set it back to mechanical chime it works like it should now.