Using New Outlook on Windows for personal email, calendar, and contact management
Hi!
It is recommended to have at least one verification and recovery method available. I am not sure if you want to change the email address or add another method, but either way, you need to have access to your account and have at least one of the verification methods available.
Go to https://account.microsoft.com/security > Sign in with your Microsoft account > You will be able to change all security information.