What are some common causes of a Google 403 error on a mobile app?

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Grade: Education Subject: Support
What are some common causes of a Google 403 error on a mobile app?
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Common causes of a Google 403 error on a mobile app include incorrect API keys, expired tokens, network connectivity issues, or problems with the app's authorization process. Also, ensure you're using the correct OAuth 2.0 flow for the service you're trying to access.