'As a mobile app developer, how do you debug from end users' device?

This is a question not related to coding. I am a junior mobile app developer with 1 year experience and have vague idea about how things really work in mobile app development industry. Recently I'm facing an issue where one particular functions works well on my device and all devices of other testers in my team, but there's one end user who keeps complaining about that function is not working on his phone. I know I can debug from any devices that I have access to (including client's device) by reading error messages on console, but how do I debug from end user's device?



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