For this problem I would suggest speaking with a Nest Tech person on the phone. You can open a support ticket here at this website and once you enter the information there is an option to escalate to phone call and speak with someone. To the best of my knowledge they are there 24/7
Good luck and if they get you up and running please return here and let us know how they fixed it. It will no doubt help someone else who runs into this problem going forward.
This can happen if you are trying to install the new 2nd gen Google Nest Indoor Camera in the Google Nest app rather than the Google Home app. The Google Nest cameras and doorbells released starting in Sept. 2021 work ONLY in the Google Home app.
A few customers have reported this happening even if they are using the correct app, but have been able to get around the problem by using a different phone or tablet for the install. Odd.
@bradtxn, thanks for posting here in the Community. How's it going with your Nest Camera? Were you able to add it to your App? Also, were you able to read the information shared above? Let us know if you've reach our support team.
I appreciate the help, EmptyNester and MplsCustomer.
@bradtxn, just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, we would be happy to keep it open. If there's more we can do, just let us know.
Thanks for lending a hand, Juni.
If the QR code does not work in either the Google Nest app or the Google Home app, and if both apps report an incorrect serial number, then, as @EmptyNester suggested, you should consider contacting Support for a replacement for what seems to be a defective camera: