Google Sign-In blocked – App has not completed Google verification (Error 403)

[josephsam-hub]

When trying to sign in with Google, the authentication fails with a verification error.

Error Message:

Access blocked: codestun.github.io has not completed the Google verification process.
The app is currently being tested, and can only be accessed by developer-approved testers.
Error 403: access_denied

Suggested Fix:

Add users to the OAuth consent screen → Test users list, or

Complete the Google OAuth verification process so the app can be used publicly.
ScrenShot: