Thanks for your question!
At this time Amazon Music HD is not supported within the Bose Music app, however Amazon Unlimited and Prime accounts are supported.
If you have further questions do let us know.
Aug 3, 2020
About: "Amazon Music HD is not supported within the Bose Music app".
What about playing HD via the Amazon app? It shows the HD indication when playing a record on a Bose Home Speaker, but I cannot tell if it is really playing HD.
Basically the question is, independently of the app, does the speaker itself supports Amazon HD?