Google Nest Community

Have you set the permissions to allow device as well as to allow connections in cast or device or even third party apps settings ?

Check your wires on door cam for kinks or weak spots or even small cuts in the line witch may seem harmless but could be the direct cause of no playback and related issues . *Good luck *

Of course you disconnected your whole system and turned everything off and re-set the doorbell cam correct? Be sure to follow proper linking procedures when connecting (whole system) together, as well as back to your wifi .