Dolby Atmos MP4 exports sound bad- what's going on?

What files dot you send to your clients for checking your Atmos mix ?
The question seem simple as long as it's plain .wav stereo or binaural files. But what if your client wants an immersive version to play on an AVR ?
Website : www.atmosmixer...
Link to this video : • Dolby Atmos MP4 export...