1. Install the Microsoft Authenticator app on your smartphone. 
    Apple AppStore (iOS): https://apps.apple.com/de/app/microsoft-authenticator/id983156458
    Google Play Store (Android):  https://play.google.com/store/apps/details?id=com.azure.authenticator

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  2. Open the app and click on Add Account → Work or School Account.
    When asked if you want to allow the app to access your camera, select Allow. This will allow the authentication app to take a photo of the QR code in the next step.

  3. Open your browser and open https://aka.ms/mfasetup
    Sign in using your email credentials.

  4. Click on Add method.

  5. Select Authenticator app as your method.
    Click on Continue, until you get to the QR code scanning.

  6. Scan the QR code with the authentication app we opened in the second step.

  7. After scanning, you will receive a pop up in the Authenticator app. Confirm the request and finish the setup by clicking on Next. 

  8. Tap on the newly created account and then on Enable Phone sign-in.
    Continue through the setup dialog. Once you're done, you can use your phone to securely sign into your account.