My 9th generation iPad will not update.

Do you have any security Apps (such as Norton) or VPN installed on your iPad? If so, these may be interfering with your iPad's internal routing table - and may interfere with AirPrint/AirPlay and other Apple services. It may be necessary to temporarily remove such Apps from your iPad - and then perform a forced-restart of your iPad.

While restarting your iPad, a further restart of your WiFi Router may be helpful.

You’ll need to restart your network devices in the correct order. Assuming that you WiFi Router provides DNS services for your network, restart devices in this order - allowing time for devices to fully boot/restart prior to restarting other devices:

• WiFi Router
• Upstream wired Network Switch(es) (if any)
• WiFi Access Points / Network Extenders
• Other fixed infrastructure devices - such as Printers
• Client devices (your iPad)

Restarting your iPad, after restarting other devices in the correct sequence, is most simply achieved by a forced-restart of the iPad:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.

• On an iPad with Face ID: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.