2) Once logged in to your Apple ID account, complete the form to the best of your knowledge to see if your organization already has a D-U-N-S number.
A) If Apple locates a D-U-N-S match, you will see this:
Check your email for your D-U-N-S number, and proceed to enroll in the Apple Developer program.
B) If Apple does not locate a D-U-N-S match, you will see this:
Double-check the information, and submit the form to request your D-U-N-S number. Dun & Bradstreet will mail you your D-U-N-S number within a week. Some organizations are required to wait 7 days before using their D-U-N-S number. If this applies to you, you will have to wait 7 days before you will be able to enroll in the Apple Developer program.
For more details on the D-U-N-S process, visit Apple.com.