If the Intel SST microphone is not working on your computer, then, first of all, you should try restarting your computer.
If that doesn’t work, then try reconnecting all the peripherals, this will work if you have an external microphone that is not working.
Also, this time when you are connecting, make sure that all the connections are tight. If that is to no avail, then follow the prescribed solutions to resolve this issue.
-Uninstall Intel SST
-Use Intel Driver Support Assistant
-Run Audio Troubleshooter
-Replace the driver with HD Audio Controller.
If you need more guide, you can find it below..
https://www.thewindowsclub.com/intel-sst-microphone-not-working-on-windows