You will need to discuss this with Apple Developer Support, or with iTunes Support. Nobody around here can assist with issues with developer program enrollment. We’re other users, and some here are third-party developers. Not Apple.
In general, and some or all of this may or will not apply to this particular case…
You will need a major, internationally-recognized payment card associated with the Apple ID. Don’t bother trying to use an Apple ID balance or an Apple Gift Card to enroll. That won’t work.
Traditionally, you will also need an email-format Apple ID, and not an Apple ID that is a mobile telephone number.
Do not use a VPN client when enrolling in the program.
A few folks have issues receiving telephone calls from international numbers, as well. If you need to contact Apple Developer Support, they may (will?) need to call you back. The number you provide must be reachable from wherever Apple is calling from.
If you are located in India, you must enroll via the Apple Developer app.
Paid program members can be individual developers, or can be certain legally-recognized organizations. The latter enrollment path requires a DUNS number.
You will need to be in a country or region where Apple is active, and will need to be someone or some legal entity that Apple can legally do business with; not a denied person or denied entity.
Here is the Exhibit A list of countries and regions:
https://developer.apple.com/support/downloads/terms/exhibits/Exhibits-to-Schedule-2-and-3-20230828-English.pdf
If you want to keep things separate (as can be reasonable for many cases), creating a new Apple ID and enrolling that in the program, and using that (just) for Developer and App Store activities and such. You can enroll your own Apple ID (this works fine!), but that can get tangled with whatever personal info and purchases are already associated with your Apple ID. Apple has gotten better about allowing you to transfer one or more of your apps to other developers as needed, though.
If enrollment issues persist, contact Apple:
Support - Apple Developer
Additional enrollment info, per Apple:
Before You Enroll - Apple Developer Program
Enrollment - Support - Apple Developer
System Status - Apple Developer (the servers must not be wobbling)
