In the course of creating your Apple Developer Accounts, did you create an individual account (sole proprietor)?
Then we need the "app-specific password" from you to successfully submit your app to the Apple App Store. 

This is quite easy to create.
Simply log in to your Apple-ID account page.  

Within the "Safety" menu item, click on "create password" under "app-specific passwords". 

As a name, you can enter "My app", for example.

The app-specific password will now be displayed. Copy the password and send it via email to [email protected].

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