iPad keyboard click, camera should and lock screen sound not working

If the lock screen sound, keyboard click and camera sound aren't working on iPad, but you find other sounds are, such as music, ringtones etc, it is worth checking the control centre by swiping down from top right of screen as the system may have been muted.

It's important to note that while in this state, in settings, the keyboard click and lock screen sound options will still show as enabled.