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ERROR_MEMBER_IN_ALIAS
A local-group add request duplicated an existing alias membership
SamrAddMemberToAlias and NetLocalGroupAddMembers add existing principals to a local-group style alias. ERROR_MEMBER_IN_ALIAS reports that the same member relationship is already present. It is not the same as ERROR_ALIAS_EXISTS, where the alias object itself collides during creation, nor ERROR_MEMBER_IN_GROUP, which concerns a group object rather than an alias.
Idempotent configuration tools can usually verify the existing SID and accept the desired membership as already satisfied. Interactive or transactional administration should still record the duplicate because it can reveal repeated workflow execution. If a same-named account from another domain was expected, compare SIDs: the existing membership may belong to a different principal.
What to inspect
- Enumerate the alias and compare the existing member SID with the requested principal.
- Distinguish duplicate membership from duplicate alias creation.
- Avoid remove-and-readd cycles when the correct membership already exists.
References
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