In this video, I'll show you how to fix your mic on your PC. If your microphone isn't working, then follow these simple steps.
First, search for sound settings in your search bar or click on settings and then click on sound. Then select your audio input device and make sure it's selected to the device that you're using as your microphone.
Below that, you should see a test microphone option and it'll show you moving sound levels if it's working and picking up sound. If it's not working, then go into your privacy settings and then click on microphone and make sure it's enabled on your PC.
After that, you can go into your sound settings and click on advanced sound options and make sure that every open app has the default input device selected for audio or select the audio input device individually to make sure it's catching the correct microphone that you're using.
The last step is going into the settings for whatever app you're using and checking the audio settings there to make sure the audio input has the correct microphone selected.