For businesses using Office 365 and Microsoft 365, add a setting that requires your users to log in using multi-factor authentication. When you make this change, users will be prompted to set up their phone for two-factor authentication next time they log in.
Using multi-factor authentication is one of the easiest and most effective ways to increase the security of your organization. It’s easier than it sounds – when you log in, multi-factor authentication means you’ll type a code from your phone to get access to Microsoft 365.
Enabling MFA in Office is one the steps toward best practices and it also improves your tenant’s secure score