I have made a Canvas App that is integrated in Dynamics 365.
The app is doing som magic in D365 and then send a list of recipent to Flow that distribute a FormsPro Survey.
It works flawless for me, but for other user I get 400 BAD REQUEST.
I am a bit confused of how Flow and FormsPro works regaring user context.
In Flow (FormsPro connector) I can only list surveys that are created by me and as far as I now this is exactly how FormsPro works, you can only send your own surveys (but your can share for collaborating with others with results etc).