How to authenticate using Microsoft Azure MFA
When you sign into a system or site secured that uses your Microsoft Azure login, you will be automatically prompted for the MFA login with the below window.

Choose your preferred method to receive the code

Enter the code and select Verify
* Note: If you check the Don't ask again for XX days box, your computer will become a "Trusted Device". Trusted devices don't require MFA and you will not be prompted for the verification code on subsequent logins until after the specified number of days.