I can’t help you with fit file export, but can propose another way.
Hammerhead can sync workouts from TrainingPeaks. You can create free TrainingPeaks account (you can schedule workout for today and tomorrow), then sync workouts from Intervals to TraininingPeaks with this app Tp2intervals - Copy TrainingPeaks and TrainerRoad workouts\plans to Intervals.
In this case, you dont’ need to export any files, only run the app and click buttons.
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