Launch the Microsoft Authenticator App, and accept their privacy agreement by tapping the "I agree" button.
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Tap the option to "Scan a QR code" under Work / School Account.
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You may be prompted to allow the Microsoft Authenticator app access to your mobile device's camera. You will need to accept/approve this request in order to take a picture of the QR code.
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Use the app to take a picture of the QR code that is on your computer screen.
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Once the code has been scanned successfully, your account will appear on the home screen of the Microsoft Authenticator app.
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Back on your desktop or laptop computer, click the Next button.
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You will see messages that your activation status is being checked. Once the check completes, click on the Next button.
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A push notification will be sent to your mobile device for approval. Approve the sign-in when you receive the prompt.
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Finally, you will be prompted to enter your phone number, in case you lose access to the mobile app. Enter in your mobile phone number, then click Next to finish!
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Your account is now protected by multi-factor authentication, using your mobile device and push notifications!