Keyboard clicks

Ensure that you have enabled Keyboard Clicks in iPad settings:

Settings > Sounds > Keyboard Clicks - set to ON

If you cannot hear Keyboard Clicks when enabled, check your audio volume is turned-up using the Control Centre volume slider. Also check the you have not enabled Silent mode as illustrated here:

If you are experiencing difficulties setting the volume of System Sounds independently of your audio volume, try disabling Change with Buttons in your Sound settings:

Settings > Sounds > Change with Buttons

With Change with Buttons set to OFF, your physical volume buttons will only alter the audio volume; the volume of your System Sounds are then fully independent of the physical controls, and changed only via iPad Settings.

I would check the volume level and also in control center to see if silent mode is turned on.

Hope this helps.

Paul