There could be several reasons why your phone flashlight is not working. Here are some possible solutions you can try:
Restart your phone: Sometimes, restarting your phone can fix any software issues that are causing the flashlight to malfunction.
Check the flashlight app: Make sure the flashlight app is up to date and that it has the necessary permissions to use your phone's camera flash. You can also try using a different flashlight app to see if that works.
Check for physical damage: If your phone has been dropped or exposed to water, the flashlight may not work properly. Check for any physical damage to your phone and see if there is any debris or dirt covering the camera flash.
Battery level: If your phone battery is low, the flashlight may not work. Try charging your phone and see if that resolves the issue.
Hardware issue: If none of the above solutions work, it's possible that there is a hardware issue with your phone. In this case, you may need to take your phone to a professional to get it repaired or replaced.