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

Ben's answer notes this, but I want to call it out:

Make sure the bundle id of your app matches the expected bundle id in iTunes Connect.

This error message occurred for me when the bundle ids did not match.