If you have older Google Nest cameras or doorbells as well as any of the newer Google Nest cameras and doorbells released starting in Sept. 2021 you are stuck with having to use 2 apps. Google Nest decided that its newer cameras and doorbells would work ONLY in the Google Home app and NOT in the Google Nest app or on the home.nest.com website. And administration and notifications for the older cameras and doorbells is still handled by the Google Nest app.
You can see the live feed for all of your cameras and doorbells in the Google Home app and on the beta/preview website, home.google.com.
Just one quick final follow up since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.