I have been streaming Amazon Music Unlimited for over 3 years now. I spent a couple of thousand dollars on equipment and tried numerous ways to use this service, but never without all sorts of problems that Amazon can't or won't address.
I have tried to stream through Amazon's apps on my iPad mini, my Roku box, and my Google TV. For nearly a year I tried two different Eversolo A6 Gen 2 streamers. But I can't get Amazon to consistently play an album or a playlist without it arbitrarily stopping at some point (sometimes in mid-song). As I write this, I have been trying for about half an hour to get it to play any album or list past the first song. I don't have this sort of problem streaming videos from Netflix, or Amazon, or You Tube, or anything other source. Selections play when I start playback and end when they are done (unless I intentionally stop playback myself). So, I am assuming that there is no problem with my Internet connection.
Amazon has wasted a lot of my time by not responding to my repeated requests for help and offering no explanation for this behavior and taken no action when I reach anyone who claims to want to help. I have tried other streaming services, but they all have smaller libraries (omitting music that I frequently listen to) and many of them have poorer quality for approximately the same price as Amazon Music Unlimited. (The only ones that sounded comparable to my aging ears were Tidal and Quobuz.)