I just brought the Vizio Dolby Atmos Sound Bar from Costco and it plays Dolby Atmos from Xbox One S beautifully !! So I went ahead and bought the Amazon Fire TV 4K and plugged into the sound bar and tried playing the 4K UHD version of Tom Clancy;s Jack Rayan from Prime video, The only two audio options I am getting is 'Stereo' and 'Dolby Digital Plus' and no Dolby Atmos. I have tried all the connections and re-boots and nothing has happened. Any help will be really appreciated.
Have you checked to see if your Fire TV Stick 4K is up-to-date with the most recent software version?
To view your currently installed software version and check for an update:
Select Settings > Device > About from the Fire TV menu.
Tip: If you don't see a "Device" option, look for System and select that instead.
Look for the Software Version section to view the software version currently installed on your Fire TV.
Select Check for System Update to see if a software update is available for your device.
If an update is available, it starts downloading automatically. After the download is complete, select Install System Update to install the update immediately. Otherwise, the update will install automatically the next time you restart your Fire TV, or after your device has been idle for more than 30 minutes.