What does HRESULT 0x88980416 (UCEERR_TRANSPORTUNAVAILABLE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: UCEERR_TRANSPORTUNAVAILABLE means the Windows composition subsystem cannot use its rendering transport for the requested operation.

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UCEERR_UNSUPPORTEDTRANSPORTVERSION	UCEERR_FEEDBACK_UNSUPPORTED

UCEERR_TRANSPORTUNAVAILABLE

UCEERR_TRANSPORTUNAVAILABLE is a Windows User Composition Engine (UCE) HRESULT. It indicates that the channel transport required for communication with the composition engine is not available.

What to check for UCEERR_TRANSPORTUNAVAILABLE

Check session availability, application initialization, and whether the composition target has been created successfully.
Review any earlier errors that disconnected or prevented creation of the render channel.
Retry only after restoring the window, dispatcher, and graphics context to a valid state.

Microsoft guidance for WPF render-thread failures

Diagnostic discriminator: Verify that the composition transport itself can be created and reached before inspecting individual visual commands. This status means the transport path is unavailable, not merely busy or version-incompatible.

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