On your computer open a web browser and go to https://office.com click on Sign In



Enter your email address. Click on Can't access account


Click on Work or school account


Type the characters and click Next


On your phone open the Microsoft Authenticator enter the code.  Click Next



Create a new password.  Click Finish 

(Note:  Password complexity at least 14 characters, a number, a special character, cannot use the last 5 passwords)