Thanks for reaching out and sorry for the delayed response.
By any chance, are you logging into your Nest app using a migrated Google account? If yes, had you signed into your Google Home app using the same email address you're using on your Nest app? You might need to also force close your Google Home app then reopen it before trying again.
Keep me posted.
Just checking in to make sure that you saw our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.
Have a great day.
It looks like we haven't heard back from the OP so I'm going to go ahead and lock the thread. If you have any further questions or concerns, feel free to create a new thread.
Have a great day,