I am using Nvidia Shield android TV with Kodi 18.5 and the audio device output setting is greyed out and the passthrough setting it is greyed out also. I have a Samsung HW-K850 that supports Dolby Atmos. So I have nimder of speakers selected as 7.1 and all the other recommend setting for DD+, the same as I had on 17.6. But, with 18.5 I can not get Dolby Atmos. Is there a bug now since NV has updated its version? I don't know I just guessing.