iPhone Mirroring worked, then stopped working
I started using iPhone Mirroring as soon as it came out, and it was working great. Very useful!
Then it stopped working. I don't know of anything I changed at the point when it stopped. Now I start up the OSX app and it says "Unlock iPhone" very briefly (but correctly referring to my phone by name) and then switches to "Unable to Connect to iPhone". I have tried resetting both the phone (15 Pro) and the Mac (M3 MacBook Pro). Both are up-to-date as of yesterday. Both have WiFi and Bluetooth on, and they are both on the same WiFi network and logged into the same Apple ID. The phone appears correctly in the device list on my Apple account, and it is the only phone on that list. I can copy and paste between the two devices, AirDrop works in both directions, iMessage sharing works, phone calls from the computer via the phone work.
iPhone Mirroring does not.
What should I try, or how can I debug this further?
iPhone 15 Pro, iOS 18