At this time the Untapped.gg Twitch Extension does not support Yu-Gi-Oh! Master Duel.

If you want to show your Deck Tracker on stream you can do a Display Capture on OBS. Alternatively, you can use our "Tracker Windows" option that will display the Deck Tracker in a separate window for you to do a Window Capture with OBS and give you a bit more freedom on where to put it.