Are any of your cameras the newer Google Nest cameras released starting in the autumn of 2021 (like the battery camera, the floodlight camera, or the new indoor camera? If so, Google Nest decided that its new 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. See this Sept. 2021 blog post: https://www.googlenestcommunity.com/t5/Blog/Message-from-our-GM-Updates-for-our-Nest-customers/ba-p/...
Google Nest has announced an upcoming upgrade to the Google Home app:
They also have this "Top Google Home app questions for Nest app and Nest camera users" blog:
And they have a preview version of a new website that provides live streaming for all of our cameras, old and new:
Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.