Invalid request error returned when attempting to connect

[mmv2307]

Access blocked: Gmvault’s request is invalid

XXX@gmail.com
You can’t sign in because Gmvault sent an invalid request. You can try again later, or contact the developer about this issue. Learn more about this error
If you are a developer of Gmvault, see error details.
Error 400: invalid_request

Additional detail was:
Error 400: invalid_request
The out-of-band (OOB) flow has been blocked in order to keep users secure. Follow the Out-of-Band (OOB) flow migration guide linked in the developer docs below to migrate your app to an alternative method.
Request details: redirect_uri=urn:ietf:wg:oauth:2.0:oob

This was using OAuth

[mmv2307]

version v1.9.1

[mmv2307]

From the 'learn more about this error' link https://support.google.com/accounts/answer/12379384

Access blocked: Third-party app is using an unsupported OAuth method
Google has safe ways for users to sign in and share their Google Account data with third-party applications. To help protect your account, Google sign-in requests are blocked from apps with less secure authorization methods because they’re more vulnerable to phishing and app impersonation attacks.

[JohnVillalovos]

To set your expectations. This project is dead and as far as I can tell the maintainer hasn't replied to anything about it in years.

[neochief]

Check this thread for the workaround: #361