@GooglePlayMusic , what's the point of paying for the "Family Plan" if I keep getting this message anyway?pic.twitter.com/Pn7B24TZ9O
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You can use multiple devices with one account, but one of those devices can stream music at a time. Since you have a family plan, you can use one of your family member's accounts on your other device to stream music simultaneously. Let us know if you have questions.
Appreciate the reply. We have multiple Google Home devices at the house w/kids, but I want to be able to stream from my phone while at work. How should I set up accounts to make this seamless? I don't want to have to baby-sit or jump through hoops if I'm already paying $15/mo 
We definitely want to sort this for you. Let's connect you to one of our Google Play Music specialists here: https://goo.gl/56Mx1y . They can provide you in-depth help.
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