PC Webcam not picking up sound - would like to use it for security purposes for viewing room and hearing noises

Hi,

We have a cheap webcam plugged into our Windows 10 PC in our office.

The webcam has two connections; USB and audio.

We used this webcam multiple times for Skype with webcam audio cable plugged into mic port on PC and USB cable plugged into PC USB port.

We are now trying to use it to view the room in our office for security purposes.

At the moment, we work at home and remote connect into the PC and can view the picture through webcam using "Camera" app on PC.

We can't however hear any sound coming from the room, even when we tested loud noises in the room in office.

We would like to have the webcam see the room and also have sound heard from the room.

How would we accomplish this?

Thanks,
Robbie