You should have either the "roles/owner <https://cloud.google.com/iam/docs/understanding-roles#primitive_role_definitions>" or "roles/appengine.appAdmin <https://cloud.google.com/iam/docs/understanding-roles#app-engine-roles>" role to be able to configure your application. Make sure you are logged in with the proper account to your project and if the issue still persists, as mentioned before, you may raise a PRIVATE ticket via the Issue Tracker <https://issuetracker.google.com/issues/new?component=491299&template=1161102> and provide us with your project id and full details on the issue you are experiencing for further investigation.
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