FP3 - Rear Camera not recognised?

Greetinsg everyone,
today i got a brand new FP3. I turned it on, set it up, updated. So far its still stock Android.
Sadly i cannot get the rear camera to work. Neither trhough the camera app nor on opencamera app the rear camera is recognised. All i see is my ugly face XD. I cleared cache already but nothing works :frowning:
Anyone has a idea?