https://www.cnbc.com/2018/01/23/apple-homepod-wont-support-stereo-multi-device-playback-at-launch.html

Apple's HomePod smart speaker won't have all its advertised features when it launches in February.

For instance, it won't support the ability to play the same music across multiple units around the home. That's a function already offered by Google Home, Sonos and Amazon Echo speakers, all of which compete directly with the HomePod.