I had to uninstall the Nest Doorbell and Nest Hub Max. Then I installed
the Nest Hub Max FIRST and set up the NEST Camera on the Hub and made
sure it worked. Then, and only then, I installed the Nest Doorbell last.
This seemed to have fixed everythin...
Okay, so I had the same above problems, Nest Hub camera would not work
during set up process when Nest Doorbell was set up already. I finally
made the Nest Hub camera work by deleting the Nest Hub and Nest Doorbell
altogether, and installing the Nest...