What does HRESULT 0x889800A1 (MILERR_DISPLAYID_ACCESS_DENIED) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Access to the bitmap was denied for the specified display identifier.

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MILERR_PREFILTER_NOT_SUPPORTED	UCEERR_INVALIDPACKETHEADER

MILERR_DISPLAYID_ACCESS_DENIED

MILERR_DISPLAYID_ACCESS_DENIED is a Windows Media Integration Layer (MIL) HRESULT. It indicates that the caller is not allowed to access the bitmap associated with the specified display identifier.

What to check

Check the display identifier, session, ownership, and security context used to request the bitmap.
Verify that the display is still connected and accessible to the current interactive user session.
Handle protected or restricted display content without trying to copy it through an unauthorized path.

Microsoft documentation about WPF hardware-accelerated rendering

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