Google Nest decided that its new Google Nest cameras and doorbells released starting in Sept. 2021 would work ONLY in the Google Home app, and NOT in the Google Nest app or on the home.nest.com website. They can now also be livestreamed on the beta/preview website, home.google.com. We've had to use 2 apps for our cameras ever since we got the new battery camera in Sept. 2021.
Thank you for your feedback on this, I fully understand the frustrations of not having your new Nest cams in the Nest app like you may be used too. However, the new Nest cameras and doorbells are exclusive to the Google Home app because we wanted to create an integrated experience with your speakers and displays.
You can now use the Google Home web app to view your cameras and doorbells. A Nest Aware subscription applies to all of your cameras, speakers, and displays in the same home structure. Thank you for your continued patience, and support.