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ERROR_SXS_DUPLICATE_IID
ERROR_SXS_DUPLICATE_IID means that more than one active SxS assembly provides a proxy registration for the same COM interface identifier. This makes the interface marshaling information ambiguous within the active activation context.
What to check
- Identify each manifest that supplies proxy or interface data for the IID.
- Ensure that one compatible proxy-stub implementation owns the IID for the active assembly graph.
- Publish a new interface IID when an incompatible interface contract or proxy implementation is introduced.
Do not attempt to resolve the conflict by loading both proxy implementations and relying on registration order.
Microsoft: activation contexts
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