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MILERR_SCREENACCESSDENIED
MILERR_SCREENACCESSDENIED is a Windows Media Integration Layer (MIL) HRESULT. It indicates that the process cannot access the screen resource needed for the requested rendering operation.
Diagnostic discriminator: Compare the same operation from the owning interactive desktop or session with the failing context. Success only in the proper session isolates the desktop or security boundary; elevation alone should not be treated as proof of a fix.
What to check for MILERR_SCREENACCESSDENIED
- Check session state, desktop isolation, remote-session restrictions, and security context.
- Verify that the target window and display resource still exist and belong to the current interactive session.
- Do not attempt to bypass screen-access restrictions with elevated privileges unless the scenario requires them.
Microsoft documentation about WPF hardware-accelerated rendering
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