Rather than answering the question, I think DEP is set up well but the setting using VPP is wrong. 1. Did you purchase Systems Manager apps and other apps from ABM and assign them to Meraki MDM? 2. Can you see the apps you bought from ABM synced to 'Systems Manager -> VPP'? 3. When adding an app on the 'Systems Manager -> Apps', did you set the puchase method as 'vpp device assignment'? If you set it up normally as above, you will not be required to itunes account when you push the app on device afterwards. Of course, users can log in using their personal itunes account, purchase and install the app.
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