As some other users I'm experiencing the issue that no rooms are showing up on my Nest Hub.
Everything works fine if I use voice commands: turning the lights on, changing thermostat, playing music.
But it's strange that there aren't any rooms and appliances to choose from, if I don't want to use a voice command.
Thanks for posting in the Community.
Glad to know that this has reached its resolution. We'll consider this thread as complete and will lock the thread now. Feel free to start a new one if you need assistance with your Google Nest devices and the Community would gladly help.