When I try to link the accounts I get an error syas cant link to my project
thanks man! I'm about to use my nest thermostat as a hockey puck! 
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I had the same error and the solution I found was to go back to the Google Project that I created (console.cloud.google.com) and then to the APIs and credentials page. Then the OAuth consent screen, the URL will look like this:
https://console.cloud.google.com/apis/credentials/consent?project=
Go down the page and look for the 'Test users' section - click 'Add users'. Now add the user account that is linked to your Google Nest. This should allow the authentication for that user to progress past the Google Validity check.
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