mic not working

Since I bought my Dahua 12MP Panoramic Fisheye Camera (IPC-EBW81230), in 2019, the microphone has not worked. Or so I thought. Watch the following video: . This may sort out your problem. My cameras are connected to a Dahua NVR and not to a PC running BlueIris.

Hello, There is a possibility that the microphone shut down suddenly. It seems that the mic stopped working on mobile after updating to Redmi Note 7 Pro. Is this a problem caused by the mobile update? Please provide a suggestion. Thanks in advance. I realize, I must have faced a lot of...