Atem mini: Video does not show although camera is recognized

Hi there,
Anais from Germany here
I wonder if someone could give me a hint:
I have installed my Atem mini together with a marshall cv 506 camera (connected via hdmi cable on port 1) and using obs studio which is linked to youtube for livestreams.
Obs studio recognizes the marshall camea which I oviously chose as video input device (?) and also records live streams but the video remains black, it is not visibly recorded. Yes, of course I removed the cover from the cameras lense and pressed the correct buttons on my Atem mini!...
Does anyone have an idea
Thank you very much
Kind regards
Anais
Anais from Germany here

I wonder if someone could give me a hint:
I have installed my Atem mini together with a marshall cv 506 camera (connected via hdmi cable on port 1) and using obs studio which is linked to youtube for livestreams.
Obs studio recognizes the marshall camea which I oviously chose as video input device (?) and also records live streams but the video remains black, it is not visibly recorded. Yes, of course I removed the cover from the cameras lense and pressed the correct buttons on my Atem mini!...
Does anyone have an idea

Thank you very much
Kind regards
Anais