Why does Laravel Sanctum consistently provide a 401 unauthorized error in a production environment?

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There could be several reasons why Laravel Sanctum consistently provides a 401 unauthorized error in a production environment:

1. Invalid or expired authentication token: The authentication token may have become invalid or expired, leading to a 401 unauthorized error.

2. Configuration issues: Misconfigured or missing settings in the server's environment can also lead to unauthorized access errors.

3. CORS: Cross-origin resource sharing (CORS) can cause issues for Laravel Sanctum in a production environment if the CORS policy is not configured correctly.

4. Web server configuration: The web server configuration may not be set up correctly, leading to unauthorized access errors.

5. Service provider errors: If there are issues with Laravel Sanctum's service providers, it could cause authentication errors.

To resolve the issue, check for these possible causes and fix any misconfigurations or errors.