Since Apple support doesn't help developers solve this problem, I'll leave my contribution here.
For those who are suffering from this error, try following this step-by-step guide:
Create a new Apple Id.
Click on Continue enrollment on the web:
After a few steps you will see the payment page:
After payment, I'm waiting for confirmation, and I hope everything goes well.
maiquitome
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I'm trying to register for the Apple Developer Program but I can't because of this error: Your enrollment could not be completed. (December 2023). Apple support has told me several times 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 :(