I have an LG 5k 27" connected to my Mac Studio and I wen't to do a FaceTime video call the other day but couldn't get the webcam to activate. This seems like a new problem as it always worked in the past. I'm running the latest MacOS and Apple thunderbolt cable. I even connected it to my 2019 MacBook Pro and got the same problem. Nothing about the monitor has changed since it last worked. Any ideas on what could cause this or have a fix?