@jarmamar
Since Google Nest has no process for moving cameras and doorbells to a new account, you'll need to remove them from the Google Nest app while still on the old account, perform a factory reset (for some cameras, the removal is the only way to perform a factory reset: https://support.google.com/googlenest/answer/9252162 ), and then reinstall them in the Google Nest app. If you have a Nest Aware subscription, you will lose your video history. If you have a 1st gen Nest Aware subscription, I don't know whether you'll be able to keep it.
