Hi,
Thank you for writing to Microsoft Community Forums.
I understand that you want to sync policies between computer and MDM server using command prompt. However, we do have a dedicated forum for issues or queries related to MDM, let me point you in the right direction.
I would suggest you to post your query in TechNet forums, where we have support professionals with expertise on MDM to assist you with the appropriate details.
Article for reference:
Regards,
Nikhar Khare
Microsoft Community - Moderator