Do you have an icon that slightly resembles a megaphone down by the clock? There is nomally the standard Microsoft speaker/megaphone icon, but a lot of motherboards come with Realtek audio chips on them, and that has a separate app, which may need configuring. If you have this, you should be able to open the app and configure any/all ports to work however you wish. See below where the arrows show the standard Microsoft audio app on the task bar, and the Realtek app above. Opening the Realtek app presents you with the more advanced options you may need to get your outputs working the way you need. If you don't have a Realtek app, then maybe you'll have something similar from another manufacturer...
