Thanks for performing troubleshooting. I understand that microphone is still not functional.
Please try few steps recommended below.
A) Press Window and X keys together, click on ‘device manager’
B) Expand ‘Sound Video and Game Controllers” and right-click on ‘High Definition Audio Device and select ‘uninstall’.
C) Restart the computer and check the issue status
If the above steps do not work try the steps mentioned below.
Go to Control Panel->‘sound’-> ‘recording’ tab -> select 'Realtek High Definition Audio microphone' and click on ‘properties’ ->on the ‘microphone’ pane select the ‘enhancements’ tab -> click the check box ‘disable all sound effects’ then click ‘OK’
Let me know if this works,
Have a great day!