Nest Deprecating API in Favor of New Device Google API

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First, I sincerely appreciate this awesome contribution!

I was working on implementing it and discovered that Nest has apparently deprecated the API being used by this Add-On. It's detailed on the Nest Developer's homepage.

https://developers.nest.com/

From my brief reading, current implementations will still work for now, but for a Nest account that has been migrated to Google already, the only option is to utilize a registered app with the new programs as outlined here:

https://developers.google.com/nest/device-access

Nest Error When Clicking the App's OAuth Link during Setup

I attempted to enroll by using my logged-in session to click the OAuth registration link, however I get the below error message when doing so.