More things to try: 1) Go to Settings > Apps > Camera > Storage. Tap Clear Cache and then Clear Data. If it still doesn't work try the next thing
2)go to to Settings > Accessibility > Advanced settings > Flash notification. Turn Camera flash notification switch on and then off to clear any system service using the led.
3) Safe mode Restart the phone while holding the Volume Down button once the Samsung logo appears. If the flash works in Safe Mode using the notification panel or camera, a downloaded app is likely causing the issue.
4) I'm aware that Samsung members app has a diagnostic function in the support tab, but I can't see a flashlight test in there so idk.
5)open the phone app and enter *#0*# If the device allowed this code to run, the screen should now open up in full brightness with some options, one is Mega Cam (you could have one that says mega Cam (rear) or something like that). Tapping it would open the camera and when you press the button to take a picture and make a loud shutter sound, this test use the flash. If it's not working here or you couldn't do this test
All of this hopefully rules out any software causing the problem. I doubt it would help but you can waiting for an update or a factory reset (backup your stuff first). At this point it's probably not worth doing and If you don't want to do that
I don't have anything else to try so I'm going to say it's a hardware problem and you should visit a service center. Maybe the LED is dead or it got disconnected somehow.
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