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WPN_E_TAG_ALPHANUMERIC
WPN_E_TAG_ALPHANUMERIC is an HRESULT used by the Windows notification platform. It means that the notification tag does not satisfy the platform character requirements.
What to check for WPN_E_TAG_ALPHANUMERIC
- Generate tags from a known-safe alphabet instead of passing arbitrary user or URL text.
- Encode or map external identifiers in a reversible, documented way where necessary.
- Validate tags before calling the notification API so invalid input is reported near its source.
Diagnostic interpretation
This result has the HRESULT value 0x803E012A. AllStat records the condition as “The notification tag is not alphanumeric.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the wpn / tag / alphanumeric 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
Avoid an immediate retry loop after WPN_E_TAG_ALPHANUMERIC. First establish what state must change, make that narrow correction, and then repeat the same operation with the same diagnostics enabled.
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