If you already have an App Store Connect account for distributing another media type besides apps (music, TV, movies, or books) or for using Apple Business Manager, the same Apple ID cannot be used to manage apps. Once you’ve completed your enrollment in the Apple Developer Program, you can sign in to App Store Connect with the Apple ID you used to enroll. As a member of the Apple Developer Program, you’ll use App Store Connect to submit and manage apps, invite users to test with TestFlight, add tax and banking information, access sales reports, and more.
App Store Connect is a suite of web-based tools for managing apps sold on the App Store for iPhone, iPad, Mac, Apple Watch, Apple TV, and iMessage.
