The AirPlay device “Apple TV” cannot be selected for audio output. Please verify your network settings and AirPlay configuration or select another device.
Before Mojave 10.14.4 (18E226) I was able to run from iTunes Home Videos to Apple Tv all my personal movies
Since last update ... wow I get that message
Luckily from AirPlay I can connect to Computers - Home Videos and play from there all my personal movies which confirms me that everything related to network settings and AirPlay configuration it's correct configured.
well ... if anybody face this issue just let me know the solution