Had the Nest wired doorbell for 2 years. Lost connection last week. Other outdoor cameras are fine. Removed from Nest and restarted process only to get stuck at entering last 4 digits of serial number. Tried to do Google Home, bur refers me to go back to Nest app. Very frustrating.
I apologize for my late response and thank you for all of your patience while waiting for a reply. I definitely understand how frustrating your situation must be, and I wanted to make sure that your concern was acknowledged. Do you still need help with this issue? I know that there's been a delay in response since you posted.
Please let me know if you need further assistance.