EE requesting second email address

We'd like to get to know you better
You don't seem to have registered a preferred email address which we could use to keep in touch with you.
All you need to do is enter your email address below and we'll send you an email to this address to verify it. You'll need to click on the link we send you within 24 hours to verify your email.
If you don't have a preferred email address, that's not a problem, just click "Skip this step".

So I entered my Orange email address which is my preferred email address and receive back from Orange...

Sorry, but the email address you entered is an Orange email address. You cannot use an Orange email address here. Your Orange email address is already stored in your website account.

Why do EE/Orange want an email address that is not with EE/Orange and is it a good move to give them a second email address?

https://web.orange.co.uk/id/profilemanagement.php?rm...

Edited by deleted (Thu 12-Sep-13 20:19:53)

In case there's summit up with Orange email or they need to send a password reminder for your Orange email that you've forgotten password and therefore cannot login (unlikely)?

Can't see any harm in giving them it, but I don't by clicking 'Skip' and bear the repetition of this request on the rare occasions I access my Member's Centre.