There could be several reasons why the flash is not working on your iPad. Here are some possible solutions to try:
Check if the flash is turned on: Make sure that the flash is turned on in the Camera app. To do this, open the Camera app, and tap the lightning bolt icon in the top left corner of the screen. If the lightning bolt is highlighted in yellow, the flash is turned on. If it's grayed out, tap it to turn it on.
Check if the camera lens is clean: Sometimes, the flash may not work if the camera lens is dirty. Make sure the lens is clean by wiping it gently with a soft, lint-free cloth.
Restart your iPad: Restarting your iPad can sometimes help resolve software issues that may be causing the flash to malfunction. To restart your iPad, press and hold the power button until the "Slide to Power Off" option appears. Slide the button to the right to turn off your iPad, and then press and hold the power button again to turn it back on.
Update your iPad: Make sure your iPad is running the latest version of iOS. To check for updates, go to Settings > General > Software Update.
Contact Apple Support: If none of the above solutions work, there may be a hardware issue with your iPad's flash. Contact Apple Support for further assistance.