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WU_E_DM_UNAUTHORIZED_DOMAIN_USER
WU_E_DM_UNAUTHORIZED_DOMAIN_USER means that a request associated with a domain user was rejected by the content path. Investigate identity, authorization rules, and service context rather than only the network connection.
What to check
- Verify the user, device, and group authorization rules applied by the update service or proxy.
- Check for Kerberos, proxy-authentication, or identity-token failures that occur before the final denial.
- Compare the same update operation under a known-authorized domain account or device policy scope.
Microsoft: Windows Update error reference
Microsoft: Windows Update proxy selection
Microsoft: Windows Update log files
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