I have spent countless hours/days trying to fix the turn-by-turn navigation. I thought it was just me not understanding flutter and MapBox integration. Apparently, there was an issue in their SDK for turn-by-turn navigation. It has been fixed for Android native SDK but not for Flutter's. There may be a way to fix it. But I've decided to go native now. Bye Flutter. 😠P.S. Share with me if you were able to make their turn-by-turn navigation a success!