Once your admin has enabled multi-factor auth, the user controls the setup process.
Launch any of the Office 365 services you use then begin signing in. Office 365 will notify you 2FA is now enabled on your account and you should proceed to set it up before continuing. For the purposes of this article, I am going to use the SharePoint app for iOS.
Choose the appropriate method of verification, whether by email or phone. I went with a text message. Tap Contact me then wait for the verification code to arrive.
Once you receive the verification code, enter it, tap Verify then tap Done to complete the process.
Note that some Office 365 desktop apps can't use a phone to secure your account. This includes Microsoft Office, Outlook, and Apple Mail. For apps like these, you will need to create an app password as a substitute for your work or mail account. Office 365 will give you a link to create your app password. Visit it before clicking Done.
And that's it. Once you set up 2FA on one Office 365 app, your device will be verified for all Office 365 apps, since they all use the same login credentials. With 2FA enabled, you'll receive an extra layer of protection from anyone trying to access your personal or work files or messages from an unauthorized device. If you're interested in more security options for your Microsoft services