Is iOS is up-to-date?
Are managed apps are up-to-date?
Is iPad free of any VPNs?
How do you fix it?
Update iOS on this iPad to the latest version by navigating to the Settings App > General > Software Update > Download & Install
After you update, click the "Inventory" app from this iPad's home screen to speed up the check in process.
If iOS is up-to-date on this iPad but you are still missing apps, and you've run the "Inventory" app, stop by the IT Office.
Seeing a message that there isn't enough available storage?
You can delete apps from the Settings App > General > Software Update > Usage Settings
From this list, you can delete games and other non-educational apps. Feel free to reinstall after the update is completed.