What does HRESULT 0x803E0115 (WPN_E_NOTIFICATION_SIZE) mean?

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WPN_E_NOTIFICATION_SIZE means that the Windows notification content exceeds the platform size limit.

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WPN_E_NOTIFICATION_TYPE_DISABLED	WPN_E_TAG_SIZE

WPN_E_NOTIFICATION_SIZE

WPN_E_NOTIFICATION_SIZE is an HRESULT used by the Windows notification platform. It means that the notification payload is larger than the maximum size accepted by the platform.

What to check for WPN_E_NOTIFICATION_SIZE

Measure the final serialized notification content rather than only the source text or template.
Remove redundant data and keep the notification focused on the information needed for the alert.
Place large details behind an app activation or deep link instead of embedding them in the payload.

Microsoft documentation

Diagnostic discriminator: Measure the serialized notification payload passed to the API and compare it with the platform limit. This result is a size violation, not a channel or capability failure.

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