I want to AirPlay music from Mac iTunes to HomePod. However, when I select it on iTunes AirPlay menu, I get "Sign in to Apple Music to play songs on your HomePod" prompt with Cancel/Sign in buttons. If I sign in, nothing happens and I get the same prompt on the next attempt.
How do I get this to work? I do not have Apple Music nor iTunes Match subscription and I don't think I need one for this.
If I choose AirPlay for the whole Mac instead of iTunes, it works. But I would like to AirPlay iTunes only instead.
What makes it even more interesting that my desired setup worked for the first few days after setting up HomePod and then stopped.