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WPN_E_TAG_SIZE
WPN_E_TAG_SIZE is an HRESULT used by the Windows notification platform. It means that the tag used to identify or update a notification is longer than the platform permits.
What to check for WPN_E_TAG_SIZE
- Use a compact stable identifier rather than a full URL, serialized object, or display text.
- Apply a documented mapping from application IDs to notification tags.
- Preserve uniqueness after shortening the value and avoid lossy truncation collisions.
Diagnostic interpretation
This result has the HRESULT value 0x803E0116. AllStat records the condition as “The size of the notification tag 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 / tag / size operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original wpn / tag / size condition.
Retry and recovery
Do not retry an unchanged request after WPN_E_TAG_SIZE. Change the confirmed precondition first, then rerun the original path and record the next result and final object state.
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