Apps in VPP but not in app list

[PoseidonPrimary]

Hi,

I run my school ipads and am having an issue with one particular App.

I can see the app listed in manage-VPP. But when I go into manage-Apps it is not showing.

I can't add new app as it recognises I already have it in my VPP.

I have bought 100s of apps in Apple School Manager and had no issues until now. No settings have been changed. HELP! 

[BlakeRichardson]

@PoseidonPrimary  is your VPP token valid? If it has expired the VPP sync will fail and you wont be able to update apps and licensing.