unknown error occurred
I'm using a Mac Pro 2013 with bluetooth turned on, connected to my wifi, and when I try to airplay from iTunes to my new HomePod it throws this error: An error occurred while connecting to the AirPlay device "Bedroom". An unknown error occurred (400). I can connect to the HomePod just fine from my iPhone X. All devices are up-to-date with latest Apple software. Restarting computer doesn't solve it.
MacBook Pro with Retina display, macOS High Sierra (10.13.3), HomePod