Here are the steps for setting up the Microsoft Authenticator as the default MFA method. 

 

 

  1. Visit the MFA Setup Page:
    • Open your web browser and go to https://aka.ms/mfasetup.
  2. Sign In:
    • Sign in with your work or school account credentials.
  3. Access Security Info:
    • Once signed in, you will be directed to the Security info page. If not, navigate to it by either clicking on the “Security info´ blade on the left-hand side of the page, or selecting your avatar in the top right corner, then selecting View account > Security info.
  4. Add Sign-In Method:
    • On the Security info page, click to select +Add sign-in method.
  5. Choose Authenticator App:
    • In the Add a method window, choose Authenticator app from the drop-down menu and click Add.
  6. Set Up the Authenticator App:
    • Follow the on-screen instructions to set up the Microsoft Authenticator app on your mobile device: 
      • Download and install the Microsoft Authenticator app from the Google Play Store or Apple App Store.
      • Open the app and select Add account.
      • Choose Work or school account.
  7. Scan the QR Code:
    • Back on your computer, a QR code will be displayed. Use the Microsoft Authenticator app on your mobile device to scan this QR code.
  8. Approve the Notification:
    • After scanning the QR code, you will receive a notification on your mobile device. Approve the notification to verify the setup.
  9. Set as Default Method:
    • Once the Authenticator app is added, you can set it as your default sign-in method by selecting Change next to your default sign-in method and choosing Authenticator app.
  10. Save Changes:
    • Ensure all changes are saved by clicking Save.

 

Reference:

Change your two-step verification method and settings - Microsoft Support

 

If you have any other questions or need further assistance, feel free to ask!