Although Apple's HomePod page states that AirPlay 2 lets you “ask Siri to play jazz in the living room and the Moana soundtrack in the kids’ room,” it doesn't make it clear that multi-device streaming requires a family account. Apple says a now-fixed bug permitted individual subscribers to listen to different music on their HomePod and iPhone.
Apple Music no longer allows parallel streaming on HomePod & iPhone without a family account
