Maybe it doesn't have any flashlight app by default. Maybe the phone's only flashlight is the monitor itself. In other words: The phone might not have a flashlight. The way to use the phone as a flashlight might be to have the monitor display a solid-white color on maximum brightness.
Of course, a phone like that still ought to have a flashlight app. It ought to! But far too many computer programmers are incompetent. I wouldn't be surprised if some programmer decided that there should be no flashlight app, if the phone's only flashlight is the monitor.