This sounds similar to the issue I had. I could connect and use in Nest
app but not showing up in Google Home app. Read through this thread for
how I solved
ithttps://www.googlenestcommunity.com/t5/Nest-Thermostats/Can-t-add-nest-thermostat-to-Google...
I see that you seem to have sorted your issue but for your info -I had
issues connecting a new stat to Google Home app when already connected
to Nest app.I solved it by changing the room in the Nest app to an
unused location.This made it show up in t...
My stat was supplied with a rectangular plate with a circular recess and
a 90 ° stand with a circular base.I think that the rectangular plate can
be used on a vertical wall or as a base for the 90° standThe 90° base
can be used on its own - this is h...
Try thisOpen nest app and change location to a room not used in Google
Home app (something like attic or garage)Open Google Home app and see if
you can now find nest app / thermostatOnce found -Still in Home app
change thermostat location to where it...
My setup is Nest learning thermostat - my email to setupGoogle Home
phone app - my same email as setupMy wife and 17 year old child as
members with control of Nest thermostatSetup Nest app with control of
thermostat for myself. Add to Google Home app...