I already have one Nest thermostat it shows in google home and the Nest app. I have just installed a new one (looks like a mirror), and it is only showing in the Home app. I like the Nest app much more than the Home app. I would really like all of my Nest accessories in one place.
I have it set to a schedule
Sleep (63F), Eco (60F), Comfort (69F)
Sleep 11p-6a, Comfort 6a-7:30a, Eco 7:30a-3p, comfort 3p-11p
That's our basic schedule. Sometimes I have a day off work during the week or my daughter has a day off school though and the thermostat isn't figuring out that we are still home so it keeps turning it into eco when we are home.
I have installed my previous devices all the same way no problem. I have had both apps for months. I have had a camera and thermostat since last year. I'm just adding a new Thermostat tonight, I already installed it, working fine. It just doesn't show in the Nest app like everything else has in the past.
Sorry, you didn't mention that there are other Nest products already registered on your account.
I thought it was just the two Nest thermostats.
Normally it should be possible to add more devices in the Nest App or Google Home App.
Once a device is registered and connected in one of the apps, it should be visible in the other app as well.
Google syncs all data in real time.
Once your Nest device is installed and active, you can connect it to Google Home through the Google Home app. Keep your Nest device powered on while connecting it to the Google Home app.
Start by opening your Google Home app. You’ll see all the existing devices connected to your Google Assistant Your Nest device will be visible once it’s connected.
From here, select the plus sign at the top left corner of the screen. This icon will allow you to add a device to your Google Home system.