Nest cans set up correctly in Google Home app and visible and controllable in the app. Cams are controllable using home away routines but not using any other routines or voice commands. “Hey Google, turn off the front door camera” gets a response of “Sorry, it looks like that device hasn’t been set up yet. You can do that in Assistant settings”. This is despite being clearly set up in the correct home.
We've had Google Nest cameras for years and are not aware of any capability to turn the cameras off or on via a Google Assistant voice command.
These are the options Google Nest lists for turning cameras on or off:
@Awhan thanks for reaching out. What you are referring to is cool and an interesting feature. We appreciate your interest however, we don't have any news to share about this feature. We're always looking for ways to improve and we'll take it as feedback. I'd suggest you send feedback about your concern using this form to let the Google Engineering team know about your concern. While they won't respond directly back to you, this is the best way to let them know about this. Please let me know if you have other questions or concerns as I will be locking this after 24 hours. Feel free to start a new thread and we'll be happy to help.
Thanks for answering MplsCustomer.