Apple TV not playing AC3 5.1 audio

I’m having issues with AC3 5.1 audio, it will not play. I have to change the audio to ACC stereo. I’m running a Qnap TVS-871 server with Plex 1.24.5 through Wi-Fi to an Apple TV 4 generation running tvOS 15.1.1 & Plex 7.24. I’m pretty sure it isn’t any settings in the server because I can play Plex through the smart TV with AC3 5.1 audio and there are no audio issues. I’m pretty sure it has to do with the setting within the Plex Apple TV app 7.24. Please let me know your thoughts.

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