screen mirroring doesn't work!
On my iPhoneSE at iOS15.4.1, I want to mirror to my Silicon M1 iMac (Monterey). I have the Mac set up in Sharing for AirPlay Receiver. I go to Screen Mirroring on the iPhone, and I'm presented with a screen with a diddly rotator in the upper right, and NO Macs (or anything else) identified. What's going on? Why doesn't my iPhone see my iMac?