How to add additional "contact me" information to an apple-id
Try add an Apple ID using these steps:

To add an additional email address, follow these steps:


Sign in to your Apple ID account page.
Click Edit in the Account section.
Under Reachable at, select Add More.
Enter your additional email address and we'll send a verification to that address. Enter the verification code and click Verify.


If you didn’t get an email:


  Make sure that you enter an email address that you're not already using as an Apple ID. If you want to delete one of your additional email addresses, click  x next to the address.


If the error keeps showing people who have experienced it:


  They had to transfer me to a Senior Advisor who after listening to my explanation concluded that this had to be forwarded to the Engineering Department and for this he had to create a ticket and do some folllow-up.