1) Sign in to your organization’s Apple ID account that you created in step 1.
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.