iTunes software service authentication error domain error 434

Question

I am uploading iPhone application using latest xCode 8. I have good internet connection and all the relevant settings set up at iTunes connect. My distribution profiles are also

Answer 1

I had this same issue, but it turned out I used a different profile in the Xcode project, then when I tried to validate the app. It wasn't noticeable since at my company we use multiple Apple id's under the same businessname. Maybe checking this helps?