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PEER_S_ALREADY_A_MEMBER
Peer identity is already a member
PEER_S_ALREADY_A_MEMBER is HRESULT 6488070 (0x00630006) from winerror.h. AllStat describes it as “Already a member.” In the Windows Peer-to-Peer graph, group, event, connection, or subscription state, the value reports a nonfailure state that must not be collapsed into plain S_OK.
This result is actionable completion information and may require waiting, reconciliation, fallback, or user disclosure.
Where the status is encountered
- Peer Graphing data-store creation and connection; capture the exact API, object, and phase because the same numeric success severity does not define the state by itself.
- Peer group membership and event processing;
- Record subscriptions and offline synchronization;
Keep it attached to the operation that returned it. Interpreting it outside that API contract can turn a normal continuation or partial result into an incorrect retry or false completion.
What must be true before accepting it
Verify that the existing membership matches the intended group, identity, role, and credentials. The caller should reject a path where outputs and state do not match the recorded condition.
Also confirm that returned outputs belong to the current operation generation and were not inherited from an earlier attempt.
Correct handling and recovery
Reuse the membership and refresh its current state instead of issuing another join. Re-enroll only when identity or role differs.
Retry after it only when a recorded input, capability, resource, policy, or state has changed.
Difference from nearby results
Already-connected concerns an active connection; already-a-member concerns durable membership.
Using one generic success branch for this HRESULT and its neighbor can lose output, repeat work, or misreport completion.
Practical scenario
A setup wizard attempts to join a collaboration group twice. It finds the same member identity and proceeds to connect without creating duplicate credentials.
References
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