Hello! Google is shutting down the Google+ API starting January 28, 2019. It looks like one endpoint in that API (plus.people.get) is used by Looker as part of the Google Auth flow. I can confirm in the Google Developer Console that our credentials we issued for Looker are making calls to this API endpoint. We are using 6.2.22.
Docs on the API shutdown: https://developers.google.com/+/api-shutdown
Is this a known issue with documentation I should follow along with somewhere? Thanks!