Make sure the devices you have are registered under the account that's associated with your unlimited music.
To change which Echo can play your music, you have to say the device name that you want to play your music.
Can you change Alexa’s name? Can you change her voice?
Can we change the name Alexa on the Echo?
Is the echo compatible with my iTunes music?
Which Amazon Echo should I purchase to play music from one room to another in my home?
Can I watch Amazon Prime video through Echo Dot?
How can I connect my Echo Dot to my stereo?
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Copyright © 2018 HubPages Inc. and respective owners.