I have provided Facebook app id. Initially I provided wrong id and it didn't work at all. Then I replaced it with a correct one and now it works, but not with native app.
This is happening on iOS, I haven't tested android yet. I am logged in to Facebook and use it pretty often. Web view pop-up asks permissions for the correct app, so that part seems to work.
Perhaps, there is something extra I need to do because I'm using a custom debug scanner build?