Unable to upload to App Store with Xcode 7.1

Question

When trying to upload an app to App Store in Xcode (7.1) I\'m prompted with this error message:

iTunes Store operation failed. You are not authorised to u

Answer 1

I found that when I switched the project from manual managed signing, to automatically manage signing the issue hit me (I'd done this to add a new device for testing) - switching back to manual signing fixed the issue.