macOS High Sierra 10.13.6 Airplay 2 issues

I have the same issue. Only to Apple TV. There is a dash in the box instead of a check mark. If I can actually select the apple tv to play to, it plays for a few seconds (but with no sound) and then stops.

I did a time machine install back to before the 10.13.6 update and it works so something has happened in latest Mac OS install and or iTunes 12.8. Frustrating.

I have got it to work in safe mode but when I come back it messes up again.

I've been searching constantly and this is the first time I've seen others with the same issue.

I guess will have to wait for next update to high sierra and or iTunes I guess.

Same problem happen to me...

I use to have it all working fine and since I have updated to 10.13.6 it is not working anymore.

I hear the sound only on the iMac or on the Airplay NAD amplifier but not on both as before.

Also, every time I make it works on the NAD (only) I have to raise the volume back to an audible level on the NAD.

This is a new issue as the NAD is located in another room.

This is on an new iMac 27" 2018

I have exactly the same problem.

I've found a workaround in that if I select an older device (airport express) as well as the Apple TV, then they both play, but if I select just the HomePod, or Apple TV on their own, I get the blue minus box as shown in your picture.

This is only since the Airplay 2 update, before then all worked fine.

I can play the HomePod or Apple TV singly from iPhone, but not from iTunes on my mac.

Along with the macOS 10.13.6 update there was also an iTunes update to 12.8 that is needed for Airplay 2 to work. Did you update your iTunes app?

Download iTunes 12.8

I have the exact same issue. Cannot find a solution. My iMac is from late 2009.

I did a re-install of the iTunes app, and this seems to have solved the problem! Fingers crossed.

Yes that worked for me too, for a while. Then it failed again. I have to use Airfoil to airplay to my speakers.

I have a variation of this problem, in that my amp no longer automatically turns on via airplay when selected.

I have the same issue on a iMac late 2009.

This workaround works for me as well. I think this forces the use of Airplay 1 instead of Airplay 2.

thanks.