Your MDM system must specify the AssociatedDomainsEnableDirectDownloads property (set to true) when issuing the InstallApplication command - https://developer.apple.com/documentation/devicemanagement/installapplicationcommand/command. See the documentation - https://developer.apple.com/documentation/devicemanagement/installapplicationcommand/command/attributes of the InstallApplication command attributes for details.
So this is something your MDM vendor will need to implement and provide means of enabling the direct downloads for your app.
gaste
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