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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 discriminator: Measure the encoded group identifier before changing notification content or channel state. This result identifies the group-size contract, so retries with the same oversized value cannot change the outcome.
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