Hey Faraz,
I stick to the brokers that are listed on the brokers’ page and I did not have an issue. Even I am not sure if Dukascopy is a market maker or not???
Anyway, what Richard says is right.
Also, did you watch the new video from Petko where he shows how to fit the Historical data from the App for your broker? It works fine with JFD. Here is the video: