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STATUS_DS_DUPLICATE_ID_FOUND
A unique directory identifier resolves to multiple objects
This is a data consistency problem: the directory lookup expected one object but found a non-unique identifier. The failing operation may only be the first caller to notice a duplicate created earlier.
Avoid deleting one of the objects blindly. First identify the identifier type, replication scope and whether a stale, restored, renamed or synchronized object created the duplicate.
What to inspect
- Capture the identifier used for the lookup and search all relevant naming contexts.
- Compare objectGUID, objectSid, SID history, UPN, DNS and legacy names as appropriate.
- Check recent restore, migration, sync and domain rename activity.
References
- Microsoft: Global Catalog
- Microsoft: AD replication concepts
- LDAP schema model: RFC 4512
- Microsoft Open Specifications: NTSTATUS values
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