Huge Mobile date usage on Intune managed devices:
Apps are being updated via the company app store (e.g. Outlook / Word / Excel / SharePoint etc.) not only via WLAN but also via UMTS.
In case the user is not in a WLAN at the time the update is available the Apps are being downloaded via UMTS. This will cause very high Mobile Data usage as shown below in the area Systemdienste /Generell. General is always high after the automatic updates of APPs that are pushed to the device via VPP/Intune.
As there is no such option in Intune which stops the apps from updating over Mobile Data or only allows updates of that pushed apps via. W-LAN everyone that is not connected to a wireless lan when the update of that apps starts will have a huge date usage on their mobile contract.
Here you can see that Apps are updating while the User is not connected to a W-Lan. (those are all Apps that are pushed to the Device via Intune/VPP
There is no way to configure the Intune System the handle the App updates with WLAN only. This is by the way the standard behavior for the normal app store (vs. Company app store) and all apple users updating their apps per WLAN only.
Data volumes bigger than 2GB per month will be caused by this situation which is known by Microsoft since January 2019 and not solved yet. Even more worse, SGL has the impression the issues is still not understood, even though we already had a lot of calls and e-mails with the Microsoft Support Team.