If you have been issued a new Office 365 Account, you must log in the first time to reset your password and set your recovery details.
Click on Sign in
In Outlook, click on the Settings Gear, then press View all Outlook settings. Or go to: https://outlook.office.com/mail/options/mail/layout
Enter another email you manage then click on email me. If you are a student or faculty member, use your @viking or @k12 email address.
Check your email that you entered as your authentication email for a verification code. Enter it, then press verify.