There could be various reasons why your microphone is not working in Windows 10. Some possible causes include incorrect microphone settings, outdated audio drivers, hardware issues, or microphone privacy settings. You can try the following steps to troubleshoot the problem: 1. Check if the microphone is properly connected. 2. Ensure the microphone is not muted or disabled in the sound settings. 3. Update your audio drivers. 4. Adjust microphone privacy settings. 5. Test the microphone on another device to rule out hardware problems.