Hello @pepijn ,
On macOS, Hexnode UEM does not currently provide a policy option that specifically blocks or restricts access to the App Store. If the App Store opens but the Get button is greyed out or app installation is not allowed, the behavior is usually related to the Apple ID being used.
Managed Apple IDs from Apple Business have restrictions on App Store purchases and downloads. Because of this Apple limitation, users signed in with a Managed Apple ID may not be able to install apps directly from the App Store.
For organization-owned app deployment, consider assigning apps through Apple Business Apps and Books and deploying them using Hexnode app management, instead of relying on users to install them manually from the App Store.
Regards,
Simon Scott
Hexnode UEM