I believe this is the result of some sort of streaming webcam driver hooking in to, and interfering with Darktide. Can you think of any webcam software you’ve installed?
I had this problem too and found in another discussion where if you press Win + R then search Appdata then in the search fatshark in the search bar and delete the folder that says “Fatshark” that is in the roaming folder. it worked after deleting that folder.