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NOTE: Before starting, please install the Microsoft Authenticator 
application on your phone. You can follow this link to learn how to do this: support.microsoft.com/en-us/account-billing/download-and-install-the-microsoft-authenticator-app-351498fc-850a-45da-b7b6-27e523b8702a
You can follow these steps if you're prompted to set up your security info immediately after you sign in to your work or school account.
You'll see this prompt only if you haven't set up the security info required by your organization. If you've previously set up your security info.
After you sign in to your work or school account, you'll see a prompt that asks you to provide more information before it lets you access your account.
Set up your security info using the wizard
Follow these steps to set up your security info for your work or school account from the prompt.
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Select Next when prompted here:
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Select Download Now to download and install the Microsoft Authenticator app on your mobile device, and then select Next. For more information about how to download and install the app, see Download and install the Microsoft Authenticator app.
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Remain on the Set up your account page while you set up the Microsoft Authenticator app on your mobile device.
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You might receive a prompt on your phone asking whether to allow the app to access your camera (iOS) or to allow the app to take pictures and record video (Android). You must select Allow so the authenticator app can access your camera to take a picture of the QR code in the next step.
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Return to the Set up your account page on your computer, and then select Next. The Scan the QR code page appears.
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Scan the provided code with the Microsoft Authenticator app QR code reader, which appeared on your mobile device after you created your work or school account in Step 5. If the QR code reader can't read the code, you can select the Can't scan the QR image and manually enter the code and URL into the Microsoft Authenticator app. For more information about manually adding a code, see Manually Add an account to the app.
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Select Next on the Scan the QR code page on your computer. A notification is sent to the Microsoft Authenticator app on your mobile device, to test your account.
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Approve the notification in the Microsoft Authenticator app, and then select Next. Your security info is updated to use the Microsoft Authenticator app by default to verify your identity when using two-step verification or password reset.
