AirPlay stopped working after upgrading from El Capitan to Mojave
I have a Late 2012 iMac 27 and a mid 2013 MBA. AirPlay used to work on both of these devices under El Capitan. I recently upgraded to Mojave (can't make the jump to Catalina yet, as I'm still dependent on a few 32-bit apps). I no longer am able to use AirPlay on either device.
If you go to System Preferences... Display... Display, there is a dropdown menu for Airplay Display but the only option is "Off." This support website seems to indicate this to mean the AIrPlay is not supported on these Macs: https://support.apple.com/en-us/HT204291
But I know that not to be true because I used to use AirPlay all the time under El Capitan. On both machines, the Mojave upgrade was a clean upgrade (make USB thumb drive installer, wipe drive, install from thumb drive, use Migration Assistant to restore accounts).
I also have a mid 2015 MBP15 running Mojave, and AirPlay doesn't work on that either.
Anyone know how to fix this?
MacBook Air