Dahua TiOC 2.0 PTZ DH-SD6C3425GB-HNR-A-PV1 Not Recording Audio

Hey guys,

I have managed to connect an external mic to the DH-SD6C3425GB-HNR-A-PV1 TiOC 2.0 PTZ.
It is a golf ball electret condenser microphone (ECM) with a pre-amplifier.

I have configured the audio channel correctly, and have two-way audio working on DMSS.
I can also hear the audio with video even when not using two-way talk.

However, when I view the recorded videos on the SD card via DMSS, I do not hear any audio.
I am using a Samsung Pro Endurance 256GB MicroSD card for local storage.

Have I missed any settings somewhere?

I am a Mac user and none of the plugins actually download (404) when using Microsoft Edge for configuring the camera.

I have also tried going through the settings on a Windows machine (which I had borrowed from a family member).
I am still unable to pinpoint any settings that I may have missed that is causing this issue.

Any pointers will be greatly appreciated.
Thank you in advance.
 
Have you made sure that audio is enabled for both sub and main stream?