[Users] Claws has stopped working with GMail in OAUTH2 testing mode

[sgeneris at comcast.net]

For Claws developers:

I have been using Claws with OAUTH2 in testing mode for several months now.
Today I could not reauthorize access -- got the rejection below.

Are you aware of the problem?
Can you pls explain the situation and how to resolve?

This is a debilitating problem that requires urgency.

Pls advse.
FP


Access blocked: Claws-mail has not completed the Google verification process
fabianpascal at gmail.com
Claws-mail has not completed the Google verification process. The app is currently being tested, and can only be accessed by developer-approved testers. If you think you should have access, contact the developer.
If you are a developer of Claws-mail, see error details.
Error 403: access_denied

Error 403: access_denied
Request details: response_type=code redirect_uri=http://127.0.0.1:8888 client_id=449393789227-0jcht91bic6nndf9v9skeg1imerd56tb.apps.googleusercontent.com access_type=offline scope=https://mail.google.com
Related developer documentation
https://developers.google.com/identity/protocols/oauth2/production-readiness/brand-verification?hl=en#projects-used-in-dev-test-stage