Are you using the 6-character alphanumeric setup code that is sometimes printed near the QR code on some cameras, as shown starting about 1:18 in this install video: https://support.google.com/googlenest/answer/11003780?hl=en ? Some customers in this forum have reported a delay after entring the code before the Google Home app displays a list of serial numbers to select from, or having to try several times.
I apologize for my late response and thank you for all of your patience while waiting for a reply. I'm terribly sorry to hear that you're having these troubles. I understand how upsetting this could be, but I'm happy to assist you with this obstacle. Id suggest that you follow these troubleshooting steps first if possible.
In the list of apps, turn on Local Network Access for the Nest or Google Home app.
At this time, I'll go ahead and lock this thread. If you're still experiencing problems, feel free to start a new thread and we'll be happy to help. We invite you to search the Community to see if a discussion is open and ongoing about your topic. If not, feel free to start a new thread.