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WU_E_DM_UNAUTHORIZED_MSA_USER
WU_E_DM_UNAUTHORIZED_MSA_USER indicates that the update content service rejected the Microsoft account context supplied for the download. The result is about authorization, not a generic failure to connect.
How to investigate
- Confirm that the intended account is signed in and eligible for the update or content service being used.
- Check whether the request crosses a proxy or gateway that requires a different authentication flow.
- Preserve the related Windows Update event and service-side evidence before changing local caches.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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