Media Capture error message due to invalid BlackMagic Media Output Configuartion

Hello Everybody,

I am trying to configure a Virtual Production Set Up. Basically what I would like to do is to have Unreal Engine send the rendered camera output back to my capture card.
When I try to start a media capture I get the following error message:

LogMediaIOCore: Error: Couldn’t create the media capture. The configuration of “NewBlackmagicMediaOutput” is invalid.

It does not specify what exactly is wrong with it.
To clarify: I am using a DeckLink SDI 4K as a capture card being connected via sdi to a Blackmagic URSA Mini Pro 12K

The Error Message looks like this:

Here is a screenshot of my output configuartion:

And here is a screenshot of my input configuration:

Did anybody have similar issues with the media Capture?

On the output configuration, try setting pixel format to 10 bit