STEP 1: Go to www.outlook.com and log in your account.
STEP 2: Click the icon on the top-right your account.
STEP 3: Click View account.
STEP 4: Click Your info.
STEP 5: Click Manage how you sign in to Microsoft.
STEP 6: Enter Last four digits of your phone number and click Send code.
STEP 7: Enter Code and click Submit.
If you didn't receive your security code at the phone number you entered, try again or try a different number.
If your code doesn't work, make sure you enter exactly the series number in the message, instead of series in the header.