This issue has been resolved on October 9th, 2019 11:45 UTC+3. You may need to re-authenticate to continue to use the connector.
We are aware of an issue where the YouTube connector (and possibly other Google data sources) may report that it is not verified and you may not be able to complete the login process. We are actively investigating the issue and have have requested assistance from Google.
We will update this article as we have more information. We apologize for the inconvience.