Hi there,
Welcome at the Spotify Community!
You can only use Spotify on one device at a time. Let's say you have 2 devices with the same account, A and B both want to listen to music.. that won't work. Only A or only B can listen to music, but not at the same time.
Also you say you start it at A and you hear it on B.. do you have Spotify Connect enabled? If yes, please make sure Spotify connect is off.
Peter
Spotify Community Mentor and Troubleshooter
Spotify Last.FM Twitter LinkedIn Meet Peter Rock Star Jam 2014
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