Devices that the computer system uses to send out or display information from the processor are called output devices.

The primary computer equipment ... hard and floppy disks and several input/output ports. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

Like we wanted the default output device, we need to select an input device as well. Open Windows 10 Settings > System > Sound. Under Input, select your headphone mic from the dropdown.