When I am using section access in Qliksense then sometimes it shows different behaviour for different Streams. I created an application & used section access and published that application. But the application shows error as 'Unsupported file format'.
But when I publish the same application with same section access file in other Streams then it's opening.
I‘m not sure that I would assume that it is a section access error, that message is implying that the “file” is in the incorrect format, not that the user doesn’t have access to the data in the application.
I would recommend that you look at how your file storage for apps is setup, whether your file storage is compatible, and then consider republishing the app to see if the file is running into some type of corruption on publishing.