Hi! Let me help you.
Sounds like Dragon just isn't picking up your mic input, even though your headset's output works fine.
First, right-click the speaker icon in your taskbar, go to Sound settings, and make sure your headset mic is set as the default recording device; check that the input meter actually moves when you talk. Next, open Dragon and run the Audio Setup Wizard (under the Audio menu) to recalibrate the mic specifically for Dragon. Also double-check there's no physical mute switch engaged on your headset, and try unplugging/replugging it or re-pairing if it's wireless. While you're in Dragon, make sure the correct mic is selected as the input device (not a laptop's built-in mic), and that the mic icon in the DragonBar is actually turned on rather than asleep. If none of that works, try a different USB port or a wired connection to rule out a Bluetooth or driver issue, and check Device Manager for any outdated audio drivers that might need updating.
Quick question: when you talk, does the volume meter in Dragon move at all, or stay completely flat?