Head-Scratcher: Sudden Oauth2 Errors on Community Connector

We were baffled today by sudden Oauth2 errors and a forced re-authorization on a Data / Community Connector we use internally to connect to Google Business Profiles API.

In Looker we get this debug message:

Exception: Request failed for https://businessprofileperformance.googleapis.com returned code 401. Truncated server response: { “error”: { “code”: 401, “message”: "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or othe…

The connector worked flawlessly for about a year without an error–our code didn’t change, was there some change on Google’s end? A temporary API outage?

It’s a real head-scratcher folks.

How odd, is anyone else experiencing this?