What DPM version are you currently running?
What kind of restore are you attempting to perform? Is your Hyper-V virtual machine backed-up on a host-level or guest-level? If you want to perform item-level recovery (ITL) for virtual machines (recover files, folders, volumes) then you’ll need to install the Hyper-V role on the DPM server.
Also note that DPM does not support item level recovery of a Dynamic Disk within a Guest VM. For this the Guest VM should have a Basic Disk.
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, thank you!
Best regards,
Leon