Can you please elaborate on "set up the data source again" a little bit?
I have a Dataset that connects to a DF as its Data Source. The Dataset refreshes just fine in my Desktop client but fails on the service. I did delete the dataset and re-publish it on several occasions but it throws the same error over and over again. Here is how it is structured: DB (privacy level organisation) + Azure app insights (privacy level none) v DataFlow (org) v Dataset (org) v Report