While authenticating an account you are presented with a warning from Google stating: "This app isn't verified. This app hasn't been verified by Google yet. Only proceed if you know and trust the developer."
- Your application needs to verified by Google as per
- If you have Verified via Google - ensure you are requesting the correct scopes, for which you have been verified.
- Alternatively a workaround - How can I whitelist my application in Gmail?
[Nylas] Google Verification Guide Powerpoint
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