google oauth error invalid_client no support email

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It seems this can happen if you did not set an EMAIL ADDRESS on the Consent screen.

  1. Go to your Google Cloud Console
  2. Open your project
  3. Click APIs & auth
  4. Click Consent screen, and set EMAIL ADDRESS
  5. As per @ajmccall’s answer, delete and recreate the client ID

This seems to have helped others, right now it does not help me. When I set an email address and click Save an error pops up:

Whoops! Our bad.

Please try again. If the problem persists, please let us know using the “Send feedback” link below. Copy the tracking number below, and include it with your feedback. Thanks!

This post seems to be about the same problem:

https://groups.google.com/forum/#!topic/google-doubleclick-for-publishers-api/6savNh4PBBI

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