ERROR_DS_NAME_NOT_UNIQUE 0x8007217B

Error code 8571 · HRESULT 0x8007217B

WINDOWS

The requested name already exists as a unique identifier.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_DS_NAME_NOT_UNIQUE is a Windows error code (system error 8571, returned as HRESULT 0x8007217B) reported by Windows. Its official message is: “The requested name already exists as a unique identifier.”

How to fix ERROR_DS_NAME_NOT_UNIQUE

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_DS_NAME_ERROR_TRUST_REFERRALERROR_DS_NAME_ERROR_NO_SYNTACTICAL_MAPPINGERROR_DS_NAME_ERROR_DOMAIN_ONLYERROR_DS_NAME_ERROR_NO_MAPPINGERROR_DS_NOT_SUPPORTED_SORT_ORDERERROR_DS_MACHINE_ACCOUNT_CREATED_PRENT4ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN

Source: Microsoft WinError.h

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