Bring Multi-Room support to AudioPlayer API streaming
Alexa Multi Room streaming does not appear to be available for third party skills that leverage the AudioPlayer API.
Feature request is to extend support for Multi Room to the AudioPlayer interface. This could be implemented by adding a custom slot type for the multi room location and then adding an optional parameter to the Play() command to allow the destination room group to be specified.
This has 37 likes and 19 comments as of Mar 2018 on this URL but doesn't show up on this feature forum - https://forums.developer.amazon.com/idea/101848/bring-multi-room-support-to-audioplayer-api-stream.html - so posting again.

Thank you very much for your patience. Your comments and votes are greatly appreciated. While we cannot promise each feature request will be implemented our team reviews each request and sends them to the appropriate product teams.
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John Wallace commented
I was so disappointed that I couldn't play My Media on my echo and echo dot at the same time
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david herzberg commented
Please support My Media for Amazon Alexa to extend support for Multi Room to the AudioPlayer interface. I have nine Echos that are grouped in two groups. I have over 700 Cds in my iTunes library. I am an Amazon Prime music subsciber - but I will not re-purchase old muisc I already own.
Come on Amazon.... This is only going to help you sell more devices and music as people find out what My Media does with your Echos and Dots. -
Mr M Churly commented
Please update the Audio API to support Multi-room audio. I would like to play my media collection in all rooms. This is the main thing holding me back on investing in more Echo's
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GP commented
When listening to a podcast for an hour and then entering a new room with another Alexa we're forced to start the podcast from scratch.
Please add the ability to pause, resume and transfer the current timestamp of a podcast to another Alexa so we can continue listening as we roam the house.
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Gregory Blum commented
Adding my vote to provide multi-room support. Please add that funcionality.
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Kevin Laird commented
Please update the Audio API to support Multi-room audio. I would like to play my media collection in all rooms. Need to use a 3rd party to do this
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patrick h murphy commented
Please let My Media have a way to play to groups.
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Randy Mazura commented
I thought it was me that was not setting it up correctly. Good it was not me but BAD that it is not yet possible!
It seems to be something we all expect!
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Keith Boyd commented
Come on Amazon, this should be a simple thing for you to provide. It's a nightmare not being able to play my own music collection on my multiple Echos at the same time.
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Lee Speers commented
Any update from the admins on this?
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John Mottershead commented
Please add multi-room and group support. I would buy a device for each room if I could use this feature.
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Mark Klingelhoefer commented
Multi-room Audio would make this app my favorite. Please enable this feature. It's ridiculous that I can use it with Spotify, but not my private collection.
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Sensel commented
This feature cannot come soon enough. What is delaying it?!
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Mark B Rosher commented
This would be really useful, pretty please. I was trying to parse a voice command to do this before reading it wasn't yet implemented.
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Tracy Whitt commented
Yes, please add since the service to use amazon was removed.
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Michael S. Merrick commented
Feature request to extend support for Multi Room to the AudioPlayer interface-- especially mymedia for alexa app. Thank you.
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Langguth, Mark commented
Mulit-room and steroe pair support for third party audio skills are really essential
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Ruben Suarez commented
Multi-room ill be a great feature for the audio skills.
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Ken Mills commented
Please add this feature for the API would be great as I could them stream my music library to multiple rooms. Please add multi room groups through the API.
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William E Betterly commented
It's such a great feature. Why wouldn't it be supported in the API?