What steps should I take if I receive a 403 Access Denied error when accessing Gmail via the API?

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Grade: Education Subject: Support
What steps should I take if I receive a 403 Access Denied error when accessing Gmail via the API?
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Ensure your OAuth consent screen is configured correctly, that the application has been granted the necessary Gmail API scopes (e.g., `https://www.googleapis.com/auth/gmail.readonly`), and that the user has explicitly authorized these permissions.