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WPN_E_GROUP_SIZE
WPN_E_GROUP_SIZE is an HRESULT used by the Windows notification platform. It means that the group value used to organize related notifications is longer than the platform permits.
What to check for WPN_E_GROUP_SIZE
- Use a compact stable group identifier rather than a full path, subject line, or serialized object.
- Validate group length before sending the notification.
- Keep the group-to-business-object mapping documented and collision-resistant.
Diagnostic interpretation
This result has the HRESULT value 0x803E0209. AllStat records the condition as “The size of the notification group is too large.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the wpn / group / size operation.
- Reproduce this result with the smallest valid input and note whether the result changes with identity, architecture, service state, or target object.
Retry and recovery
” has changed.
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