What does HRESULT 0x803E012A (WPN_E_TAG_ALPHANUMERIC) mean?

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WPN_E_TAG_ALPHANUMERIC means that a Windows notification tag contains unsupported non-alphanumeric characters.

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WPN_E_DEV_ID_SIZE	WPN_E_INVALID_HTTP_STATUS_CODE

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.

Microsoft documentation

Diagnostic discriminator: Validate the notification tag character by character against the platform tag grammar. This result isolates an invalid tag character set rather than an excessive tag length.

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