Bluesound

Using the Amazon app on an iphone or PC or through Carplay, it works perfectly well.  The problem clearly lies in the API/integration with BluOS.  Unknown is if it is software engineering at Amazon or Bluesound.  I may just try Tidal free for a month and see how it does and if Amazon/Blue figure it out by then.

If you're going to try another service, I would recommend Quboz over Tidal. You can get a free trial there as well. It just sounds better. 

I tried Qobuz but I didn't like the interface at all. Whereas Amazon has a "station" based on a particular artist, Qobuz did not seem to have that feature. The SQ was great, however. I think I'll try Tidal and see if their interface is better. If it is, then I may step up to a better streamer; I have been eyeing the Innuos Pulse. The Sense App supports both Tidal and Qobuz, and also Idagio which I also use extensively. I communicated recently with their support staff (very responsive, btw) about whether they will support Amazon in the future. They sent me an explanation on why they have given up on their plans to support Amazon streaming.

I just signed up for 2 months of Tidal ($2 special).  No issues with the Node or WiiM.  I am noticing a difference in the sound between these streamers into a DAC.  Should there be a difference?  The Node 2i sounds "fuller" and more musical.  The WiiM sounds more lean.  I disabled the EQ in the WiiM app.  I was under the impression that the digital signal would be the same.  

Amazon music is back playing on my node 2i.  Incidentally, this was the first time I had any service not playing correctly with the above error message on my node in years of use.