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WPN_E_DEV_ID_SIZE
WPN_E_DEV_ID_SIZE is an HRESULT used by the Windows notification platform. It means that the developer identifier supplied for a scheduled notification exceeds the platform limit.
What to check for WPN_E_DEV_ID_SIZE
- Use a compact deterministic developer ID rather than verbose serialized application data.
- Validate the final identifier length before scheduling the notification.
- Keep a mapping in application storage when a shorter opaque identifier is required.
Diagnostic interpretation
This result has the HRESULT value 0x803E0120. AllStat records the condition as “The size of the developer id for scheduled notification 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 / dev / id / 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
Retry only after the condition responsible for WPN_E_DEV_ID_SIZE has changed; repeat the same operation and confirm that the original failure boundary has moved or disappeared.
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