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ERROR_DS_VALUE_KEY_NOT_UNIQUE
The link value specified was not found, but a link value with that key was found.
ERROR_DS_VALUE_KEY_NOT_UNIQUE is a domain-specific Windows result.
Likely impact: Choosing an arbitrary value can alter the wrong relationship even though the parent object is correct.
Typical causes
- duplicate keyed link values exist.
- replication conflict produced competing values.
- the caller supplies a stale value body with a reused key.
- migration duplicated link metadata.
Troubleshooting steps
- Verify that one linked value owns the key used by the request.
- Collect attribute name and requested key and all matching link values.
Useful evidence
- Collect object DN and GUID.
- Collect application mapping that produced the key.
Recovery and retry
Identify the authoritative linked value, remove or migrate duplicates with replication awareness, and retry by key only after convergence.
Related errors
ERROR_DS_KEY_NOT_UNIQUE concerns object lookup by key; this code concerns a key within a multi-valued linked attribute
Example
A migration creates two link values with the same external key. Removing the obsolete value and allowing replication restores unambiguous updates.
References
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