1. Check volume control settings and make sure microphone is not muted.
2. Check if the microphone jack is properly plugged in and not loose.
3. Check if the microphone works on a different device.
4. Make sure your operating system (i.e. Windows, macOS, iOS, Android, etc.) is up to date.
5. Reinstall or clean the device’s microphone driver.
6. Check if the microphone is not disabled from within the sound settings of the device.
7. Replace the microphone if all else fails.