Why can't I connect my iPhone wirelessly to Mac Mini M4?

just got the Mac mini m4 so far triple screens works perfectly fine, can set refresh rate and res individually. but I just ran into a problem that I can't wilrelessly connect my iPhone as a webcam which I was able to with my older Macs. I can use a cable to use the camera but can't use them wirelessly. all my older Macs that I tested with are all laptops is this a thing just for Mac mini or there is something wrong with the new m4 Mac mini

[Re-Titled by Moderator]