How does a '401 error message no auth credentials found' typically impact the user experience or application flow?

This error usually prevents the user from accessing the requested resource or functionality. In a web application, it might redirect to a login page, display an error message, or fail to load data. For an API client, the API call will fail, requiring the application to handle the error gracefully, often by prompting the user for re-authentication or by informing them of the lack of access.