HRESULT 0x803E0120 (WPN_E_DEV_ID_SIZE): meaning and diagnosis

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WPN_E_DEV_ID_SIZE means that the developer ID for a scheduled Windows notification is too large.

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WPN_E_FAILED_LOCK_SCREEN_UPDATE_INTIALIZATION	WPN_E_TAG_ALPHANUMERIC

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.

Microsoft documentation

Diagnostic discriminator: Measure the developer identifier supplied to the scheduling API before changing notification content. This result is a size-contract violation in the identifier itself, not a channel, cloud, or payload-delivery failure.

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