What does Windows error code 8204 (ERROR_DS_ATTRIBUTE_TYPE_UNDEFINED) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: ERROR_DS_ATTRIBUTE_TYPE_UNDEFINED the attribute type specified to the directory service is not defined.

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ERROR_DS_INVALID_ATTRIBUTE_SYNTAX	ERROR_DS_ATTRIBUTE_OR_VALUE_EXISTS

ERROR_DS_ATTRIBUTE_TYPE_UNDEFINED

ERROR_DS_ATTRIBUTE_TYPE_UNDEFINED (0x0000200C) is an Active Directory Domain Services LDAP result. The client referenced an attribute that is not defined in the schema visible to the directory service.

What to check

Confirm the LDAP attribute name, including any application-specific schema extension.
Verify that schema changes replicated to the domain controller handling the request.
Make sure the client is querying the intended directory partition and not a different forest or AD LDS instance.

Useful command

Get-ADRootDSE -Server "<dc-fqdn>"

Microsoft: AD DS LDAP operations · Microsoft: AD DS diagnostic logging · Microsoft: Get-ADObject

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