In Aha Dolby audio problem is solved after uninstalling Kodi App. Now Dolby audio working fine in Aha.
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 in Zee5?