With a certain project in Xcode 9 beta 6 when I try to Upload to the App Store I get:
I am the \"Admin\" role for this account.
In My case none of the above solutions worked,
I have an access for both Developer account and iTunes Connect account, but I faced the same Issue.
The only option worked for me is updating my MAC OS before it was 10.13.4, after update to 10.13.6 the problem was resolved. Hope this will help to someone.