No Multi-Channel (Atmos) Playback

[HappyMax 4]

Hi,

I have installed the Emby server app (Version 4.10.2.0) on my QNAP NAS (TS-963X) and the app on my Android mobile (Emby for Android 3.5.72) with Android 15.

When trying to play .m4a files with Dolby Atmos the server plays the files only in stereo on my Marantz (SR-7015) receiver. When I play the files with my Dune media player over my Marantz everything works fine and Atmos is played. 

I can't find any settings to change this, so please help me.

Kind Regards

Max