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.

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 :(