Hello, thank you for reaching out to Microsoft Q&A.
This problem appears if Windows cannot find the required audio input drivers for your internal microphone to work.
To resolve the issue,
- Open the Device Manager.
- Expand the arrow next to Sound, video and game controllers.
- Right-click your default audio output driver (such as Realtek (R), select Uninstall device, select the " Attempt to delete the driver software for this device " checkbox, and then click Uninstall.
- Once uninstalled, restart your computer and check the audio input. See if it is recognized now.
If you are still having issues,
Type msinfo in the search bar on the taskbar.
Click Enter.
Post a screenshot of the resulting dialog box.