Updated on 14. August 2023 by Jan Bunk

Open the App Store Connect User Page.

Usually this issue occurs when you have just created your Apple Developer account. It should start working roughly 2 days after paying the Apple Developer account fee. Apple will also send you an e-mail with the subject "Welcome to App Store Connect".
So please wait 2 days and then try following this guide again. If the issue still persists, you can also try clearing your browser's cache and cookies. If that doesn't help either, please contact Apple's support.
Click the plus or "add" button.

Enter my first name in the "First Name" field: Jan

Enter my last name in the "Last Name" field: Bunk

Enter our Apple account email in the "Email address" field: apple@.................... f@ke.mailapp-control-panel.com

Click the "Admin" checkbox in the "Roles" section.
The "App Manager" and "Developer" permissions don't grant us access to everything necessary unfortunately. After your app has been published, we will immediately leave your developer account, so we will no longer have any access then.
If possible, tick the checkbox "Access to Certificates, Identifiers & Profiles". Don't worry if this checkbox is greyed out and you can't click it. That's normal and happens when you enroll into the developer program as an individual (and not as an organization).

Click "Invite".

Great, now you've invited us to your developer account! After your app has been published, we will immediately leave your developer account, so we will no longer have any access then.
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With a background in computer science, Jan founded app-control-panel.com and developed the underlying software to convert websites into apps. With experience and feedback gathered from hundreds of published apps, he strives to write easy to follow guides that help you with everything related to app creation, publishing and maintenance.