Video being recorded without audio Using AVCaptureMultiCamSession

I am trying to record video using AVCaptureMultiCamSession where input is front and back camera. But, for some reason video is being recorded without Audio. I am not getting where I am doing wrong. Any insight is helpful, thanks for your attention.

I tried with single mic also but not able to record audio with video.

I am referring to these links:-

https://www.spaceotechnologies.com/integrate-multi-camera-video-recording-ios/

https://dev.to/amitspaceo/how-to-integrate-the-dual-camera-video-recording-feature-in-your-ios-app-1li3

Video being recorded without audio Using AVCaptureMultiCamSession
 
 
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