Configurator 2 -Apps Need Sign In

Hi there

I have configurator 2 setup and am currently 99% there on getting deployment working. Scenario is as follows:

- Configurator signed in using VPP Account

- Profile made and loaded to Blueprint

- Blueprint made listing Apps required, and with Profile loaded

- Can deploy Blueprint to device no issues

The issue is iPad end - whenever I open an app deployed through Configurator, I get prompted for Apple ID Sign in. I have tried signing in with the VPP account - an error comes up then quickly disappears before I can read it, taking the App with it. If I try to use my other iTunes account, the App just hangs.

I have tried signing in in iPad settings - no success

I have tried using iTunes account instead of VPP within configurator - no success

Tried deploying the blueprint without the profile so as no restrictions could be loaded - no success

Any thoughts would be well appreciated!