Can't make “Hey Google, turn on/off <camera name>”

My cameras are named "office" and "living room" and I've try many ways to enable the camera with Google Home Assistant as explained on the documentation by saying.

• “Hey Google, turn on office"

and it doesn't work. I've try many ways and I can't get Google to understand the command. Is there any formula or a way to make this works? 

I'm trying to create an automation to turn on cameras when I leave the house. 

I can easily do that with home assistant, but wanted to make it work with Google Home.