There r 2 options in audio settings...Dolby Atmos and Dolby 5:1..Select 1st one and check..In Zee5 with Nvidia shield TV (2018) my observation is during streaming Movies with 4K titles ( like RRR, Jhund, Jersey etc.,) audio is coming only in stereo even the logo shows Dolby audio. And while streaming non 4K movies with Dolby audio ( Like Kashmir files, Radhe shyam , Simba etc.,) Audio is coming in Dolby audio without any problem..why this problem with 4K content for Dolby audio?