iPadOS is not up-to-date
Managed apps are up-to-date
iPad is free of VPNs
How do you fix it?
a. From the home screen, open the Settings app; then
b. From the left menu panel, tap "General"; then
c. From the right menu panel, tap "Software Update"; then
d. Download and Install any available updates. If "iPadOS is up to date" displays; then
e. Return to the home screen and click the "Inventory" app
Note: WA routinely updates the minimum supported version of iPadOS. If your iPad is detected as running an outdated/non-supported version, apps will be hidden. It is recommended to check for updates at least once a month, although keeping automatic updates "On" should keep your iPad compliant.
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.