Change mailing address

The following should work.

• Open Appstore Connect
• At the top right, click on your account and select "Modify profile" just under the mail
• at the top left, you will see "Apple ID" with your mail below
• click on Modify…

If that works, don't forget to close the thread, otherwise please tell what's happening.

You can also do it from developer's site.

• select Account at the top of this page : https://developer.apple.com/account/
• in email preferences area, you can edit the email address.

Mailing address, not email address. How can I change my mailing address??