[iTunes Connect] Several iTunes Providers

Problem

Your user account is attached to several iTunes providers. Create separate accounts for each provider before logging in.

Solution

Apple 目前一個主帳號只允許在一個 Team 中
意思是如果團隊中成員很多，得設定一個專門用來的帳號
其他一般的開發者就可以分佈在各個 Team 中了

Use one major account for submission.

Reference

https://forums.developer.apple.com/thread/26264