I'm having the same problem in December 2023, and Apple support has told me that there's nothing they can do, 4 attendants... terrible service from Apple, how sad, a year working on an App that I won't be able to publish :(
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I think I've found a solution, I'm just waiting for the payment to be confirmed by email.
I created an article to help, since Apple support is unable to help developers.
Error Solution -> https://dev.to/maiquitome/error-solution-your-enrollment-could-not-be-completed-4k32