It is recommended that you configure at least one other method. This will allow you to still MFA or reset your password when your primary method is not available.
Step 1
Go to myaccount.microsoft.com and click "Update Info" under "Security info."
Step 2
Click Add sign-in method
Step 3
Click "Choose a method" and select the method you want to add and follow the instructions.
If you want to add a phone, continue following these steps.
Step 4
Enter your phone number and pick method to receive a code.
Step 5
Enter code that Microsoft sends and click Next
Step 6
Click Done