This page describes how to delete security info from your Microsoft account. Security info consists of an email address and/or phone number that you give to us, which we use to make sure you're really you.
Remove an individual phone number or email address
On the Account screen, select Security, and then select Update info.
We'll send a security code via text or email to make sure you're the account owner. Follow the instructions to enter that code.
Before you remove an alternate email or phone number, make sure you have one verified option that you can use. If you only have one option and are replacing that, add the new phone or email before removing the one currently on record.
Select Remove next to the phone number or email address you want to remove.
You'll receive a notification at your existing email address or phone number. This is a precaution in case someone else made the change. If that happens, cancel the change by following the instructions.