Managing personal Outlook.com account settings, security, and privacy
Hi. I'm Brian and I'll try to help.
I think your best approach is to contact Microsoft directly using the Help feature in Outlook.com. There are many people who have reported that verification messages often don't arrive in their mailbox.
Here is an image (below) that indicates how to contact Microsoft. These forums are user-to-user and most of us don't work for Microsoft.