When trying to upload an App to iTunes connect in Xcode 8.3.3, I get the error:
iTunes Connect access for \"Team-Name\" is required. Add an account in
This happened to me when my app was rejected when uploading on AppStore (not sure if this could be connected).
I tried to remove and readd the Developer's account in XCode but that didn't help.
Then it started working after I replied to the Binary Rejected message on App Store Connect and restarted XCode. Not sure if that could be connected but it started working again instantly after those steps.