Dell XPS 13 7390 Microphone Not Detecting Sound

If your Dell XPS 13 7290’s built-in microphone is not picking up sound as an input, you may have a software problem, try the following steps to resolve your issue.

• Ensure Microphone is not muted and enabled in Windows settings and app permissions.
• Select the correct sound device if not currently selected.
• Check your microphone privacy by going to Start > Settings > Privacy & security > Microphone. Make sure "Let apps access your microphone" is On, and enable access for individual apps you want to use with it.
• Ensure your microphone is selected as the recording device.
• Make sure your microphone is Enabled in device manager. Right-click the Start button, select Device Manager, expand Audio inputs and outputs, right-click your microphone, and select Enable Device if it's disabled.

• Go to Settings > System > Sound. Click “Troubleshoot” under “Input” to detect and fix common microphone issues. You may need to restart your computer after this step.

• Install “Dell Command Update” to automatically install recommended drivers.
  If that doesn't work, you can manually install the ++Realtek Audio Driver++ from Dell's support site. You may need to restart your computer after this step.

https://www.google.com/search?q=Dell+XPS...