Unplug and plug in the input again
If you’re using a USB recording device, try unplugging it and then plugging it back in. Or try another USB port on your computer. If you’re using a USB hub, try plugging it directly into your computer instead of using the hub.
Check Operating System Settings
Check Chrome Settings
Make sure that Chrome is set up to listen to the correct microphone. By default, it will use the default microphone on the system, but you can change the microphone that Google Chrome listens to.
Install Audacity and see if your microphone is listed
Run an audio recording program like Audacity and see if your microphone is listed in the input devices list.
Restart Google Chrome and/or your computer
Try restarting Google Chrome to see if that fixes the issue. If not, try restarting your computer with the microphone plugged in.