Only hear mono sound on android mobile device with CloudXR sample ARCore client

Hi Sir,
I am working on a CloudXR project for Android devices.
I’ve implemented stereo sound in my project created in Unity.
However, using the sample apk client file, I can only hear mono sound on the Android client device.
Is it possible to receive stereo sound on the Android client device?
If so, please let me know where I should change in the sample script or other settings.

In addition, The document states “Audio is currently always stereo”, does this refer to the audio the client receives? Or does it refer to the audio that the client sends?

Best regards