If you select the TrueHD Atmos track and hear nothing, it is almost always a hardware handshake issue.
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The Cause: Your playback device (e.g., your TV’s built-in app) cannot "decode" or "pass through" the lossless TrueHD signal.
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The Quick Fix: Switch the audio track in your player to Dolby Atmos (E-AC3). This "lossy" version is designed for maximum compatibility and will play on almost any modern system. Make sure your soundbar or hi-fi set up supports Atmos playback!
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The Technical Fix: Ensure your player (Nvidia Shield TV Pro/PC) is plugged directly into your Soundbar or Receiver. If you plug into the TV first, the TV must support HDMI eARC (not just ARC) to pass the TrueHD signal back down to your speakers.