NTSTATUS 0xC0000153 (STATUS_MEMBER_IN_ALIAS): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The account SID is already present in the local alias membership set.

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STATUS_MEMBER_NOT_IN_ALIAS	STATUS_ALIAS_EXISTS

STATUS_MEMBER_IN_ALIAS

The local group already contains this direct member

Adding a member to a SAM alias is set-based and does not create duplicate entries. Because aliases can contain foreign-domain SIDs, the same principal should be compared by SID rather than by a possibly ambiguous or renamed account name.

An idempotent provisioning tool can accept the result after confirming the target alias and member SIDs. It should not assume that matching text names identify the same principal or that indirect membership is equivalent to this direct entry.

What to inspect

Resolve and compare the member SID and alias SID.
Confirm the entry is direct membership in the intended account store.
Record the existing state as success only when it matches the desired identity.

References

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