My FaceID is not working, and neither is my camera. They both worked last night.

My FaceID and camera are not working. They worked last night. I have gone to settings and tried to reset my FaceID. I did that, now it says it cannot activate. When I go to my camera, I am greeted with a black screen. All of the other camera options a visible, but the screen is black. It does not change if the camera is flipped from front to back. I have also turned my phone off and back on. My iPhone is up to date. I did have an option to get iOS 15. I did not select that option.

any advice?