You need to buy VPP licenses for the app and then check the VPP box in the app.

You are aware that for supervised devices the installation will be silent if you assing VPP licences?

Yeah, I think my guess here is that those iPads might not be supervised, meaning not in your DEP? iPad could've been purchased on a 3rd party.

These were purchased through a third-party and the MDM profile was installed manually. I will look into getting these onto DEP. Thanks!!

@alex.cisneros best of luck, keep in mind though that if it's purchased through a 3rd party the only way to supervise them is on AC2 so you would need physical access on those iPads.

Even after enrolling in DEP with Configurator, there is a 30 day period when the enrollment profile can be removed by the user. An opt out by Apple.