Appreciate the information kiltguy2112.
Cleopatra Make sure your devices are connected to the same network. Also, make sure you're able to control your Nest Thermostat using your Nest App. Has your Nest account been linked to the speaker or display via the Assistant Settings? If not, you have to link your account by following these steps.
Let us know how it goes.
Due to inactivity, I'll go ahead and lock this thread in 24 hours. Feel free to start a new thread if you need assistance with your Google speakers and we'd be glad to assist you further.