Solution in 3 steps:
Bandicam sounds/audio, not recording is the most common problem its users faced. i will show you how you can fix this problem within 1 min.
Step:1
Open the Bandi cam app on your laptop or computer. (Show in pic 1)
Step:2
Click the Video menu shown in the below picture.
Step:3
Click the Audio setting right side corner. As Shown below picture.
Step:4
In step 4 click on each section of (Disabled) shown in the above picture and select the “Microphone”. E-g: Shown in the below picture.
Step:5
In step five you will see the audio recording enable and show the wave of the sound in the bar.
This is the easiest method I have shown you in just a few steps. Hope it will help you out. For more info, you need to comment below.