What is the issue related to API that involves request with insufficient scope permissions?

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The issue related to API that involves request with insufficient scope permissions is when a user or app makes a request to an API endpoint that requires certain scope permissions to access data or perform an action, but the request does not have the required scope permissions. This can result in the API returning an error message or not returning the expected data, which can affect the functionality of the app or service that relies on the API. The issue can also pose a security risk as unauthorized access to sensitive data or actions may occur.