Casting Amazon Music

[TwinsPhysicist]

I've recently upgraded to the 1511 build of Win 10, which includes the "Cast Media to Device" option ability in Edge. I was hoping to be able to use this to cast Amazon cloud player music. However, when I try to do so it doesn't quite work. Is anyone able to cast amazon cloud player? It does something, as in it connects and the album cover of the current song shows up on the TV, but the sound still comes from my SP3. Casting YouTube works perfectly. Is the Amazon Cloud player just not a compatable web site for casting?