Should be resolved now.

Hey everyone - this is a bug and not expected behavior that we're looking into. Thanks for the heads up!

Mac App Store apps and VPP device assignment are available in the latest version of the Apps page. Under MDM > Apps, click 'Try the new version!', and you'll see the option to add macOS App Store apps, as well as import licensed applications from you...

Hello,You can limit the ability to add new user accounts on DO-enrolled devices by adding the restriction 'Disable modifying accounts' in Settings. You'll find this under 'More Android > Android Device Owner'.