In this post, you’ll learn more about the Error ERROR_GRAPHICS_CLIENTVIDPN_NOT_SET – 0xC026235C that is returned when working with the COM-based APIs in Win32
Win32 COM Error
ERROR_GRAPHICS_CLIENTVIDPN_NOT_SET – 0xC026235C
Win32 COM Error Error Description
Client VidPN is not set on this adapter (e.g. no user mode initiated mode changes took place on this adapter yet).