Hi,
Thanks for your post, according to your description, the issue seems related to DPM. While Windows Server backup forum is mainly related to Windows Server backup tool, and after research, it seems the original DPM forum has been closed. In this way, I would suggest you try to call the phone number in the below link and check if they support DPM.
https://support.microsoft.com/en-us/gp/customer-service-phone-numbers
Thanks for your time!
Best Regards,
Anne
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