A recent update has brought support for Dolby Atmos surround sound audio to the Apple TV app on Fire TV devices. Reddit user TFLK reports the discovery and notes that the Japanese listing for the Fire TV Stick 4K Max now mentions Dolby Atmos supported on the Apple TV app. When the Apple TV app first launched on Fire TV devices in 2019, it did so without support for Dolby Atmos or Dolby Vision. Support for Dolby Vision was added about a year ago and now it’s finally being rounded out with support for Dolby Atmos. I don’t currently have an Apple TV account to verify the claim, so please help others by commenting below if Atmos works in the Apple TV app and on which Fire TV model.