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There could be various reasons behind the data specified on the Laravel API resource not being returned:

1. Authorization issues: If the user making the request does not have the necessary permissions to access the requested data, the API resource might not return the expected data. Ensure that the user has the required roles and permissions.

2. Incorrect resource mapping: Check if you have correctly mapped the API resource to the appropriate model or controller. Ensure that all the fields specified in the API resource align with the model's attributes.

3. Incorrect API endpoint: Verify if the API endpoint URL is correct and matches the route defined in the application.

4. Caching: The API sometimes might return cached data instead of the updated data. Try clearing the Laravel cache and re-run the API call.

5. Pagination: If you are using pagination in your API response, ensure that the page number and page size are set correctly.

6. Database issues: Finally, it could be a database issue resulting in the data not being returned from the database. You can perform database troubleshooting to determine and fix the issue.