We now have enforced 2FA on all staff office 365 accounts, 2-step verification adds an extra layer of security to your Office 365 account, follow the below steps to successfully set it up.

Note: setup should be done on safari on your iPads or on a PC. Not through the apps. 

Set up:

  1. Sign in to Office 365 with your school account with your password like you normally do. After you choose Sign in, you'll see this page:

    First Sign in screen
  2. Choose Set it up now.

  3. Select your authentication method and then follow the prompts on the page. 

    We strongly recommend setting up Microsoft Authenticator for your verification method. It's the easiest verification method to use and its being pushed out to all staff iPads

    Choose your authentication method and then follow the prompts on the screen.

  4. Once you complete the instructions to specify how you want to receive your verification code, you'll be asked to verify it so O365 can check it works successfully.

How to use it:

After set up, the next time you sign in to Office 365, you'll be prompted to enter the code that is sent to you by the Microsoft authenticator app or text.
When you sign in with 2-step verification, you'll be prompted for a code.

Next steps

If you're using other apps like Outlook on your desktop, you'll need to create an app password so they can connect to your Office 365 account.

Source: https://support.office.com/en-us/article/Set-up-2-step-verification-for-Office-365-ace1d096-61e5-449b-a875-58eb3d74de14?ui=en-US&rs=en-US&ad=US