Problem with camera signal in Unreal - not working

I have a blackmagic camera connected to the computer through a Decklink 8K Pro. The camera works correctly in Windows, even with other programs that are not Unreal. The problem I have is that when I create a Blackmagic Media Source and give it the camera values (4K, progressive, etc.), it does not work and I cannot view it.

Please, could someone tell me how I can fix this? I would really appreciate it if you could indicate a tutorial to perform this step-by-step configuration. Thank you.