I read through this thread and I'm still having issues.
All I want to get working is having a new iPad enrolled with iOS 9 through DEP and let self service automatically download with no apple id needed.
These iPads I'm working on are already setup through DEP and are on iOS 9. They are not assigned to any user and are in scope to receive Self Service. I followed these instructions to deploy Self Service Manually instead of automatically. I also went to my VPP and purchased 2000 copies of self service, and they are showing under VPP in Casper.
I lookup the device in Casper and see that Self Service is in scope, I press Update Inventory and see Self Service trying to install, on the iPad it prompts me to sign into iTunes, I don't want to be prompted so I press cancel. Then in Casper it says failed, please log in to your iTunes Store account.
What am I doing wrong and how can I get this working?