untick the "Upload your app's symbols to receive symbolicated reports from Apple" when upload a build to app store connect should help.
Martinparker
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had the same issues as everyone for few days struggling try with a lot of credit or debit card. Today i manage to purchase it.!! It worked.What is do is i changed the confirmation email from my default icloud email address to google email address and click confirm order. It worked for me hope your guys worked as well.