The WiiM Home App supports the Amazon HD and Ultra HD up to 24-bit/192 kHz. Please login your Amazon Music account on the WiiM Home App > Browse Tab > Amazon Music and make sure your subscription supports the Hi-Res music streaming from Amazon music.  

* Please note one Amazon account can only be used to play on one device or device group at a time. If there're multiple devices playing Amazon music, it will only allow one to play when moving to the next track.