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

[CaptainCalculon]

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.

 

[TonyR]

Have you made sure that audio is enabled for both sub and main stream?

 

[CaptainCalculon]

Have you made sure that audio is enabled for both sub and main stream?

Double and tripled checked many times.