I've been using iPhone as webcam from early betas. Last week, it stopped working. I have the latest betas installed on iPhone and macOS. When I open FaceTime it doesn't trigger the iPhone camera anymore via WiFi (No camera available message), but it does work if I have the iPhone plugged in with a cable into the MacMini. Did I maybe turn something off in my iPhone settings and blocked computer access over WiFi? Continuity camera ("Import from iPhone") works fine over WiFi...