Camera stopped working after screen replacement when fully assembled.

So after I replaced the screen on my mate 20 pro the camera didn't work. When I opened the camera app (or any other app that can access the camera) the screen stays blank and it seems the screen is frozen (can't use any options on the screen / can't flip the camera).

When I take off the backplate above the motherboard the camera works fine, but as soon as I put the backplate back on the camera stops functioning.

Anything I should watch out for? Any help is appreciated!