App passwords: A password for your password
At this point, two-step authentication is set up and ready to go. This only transitions us into the world of app passwords: specialized passwords generated specifically for use with apps that don't support Microsoft's two-step authentication. If you use Outlook.com email on your non-Windows smartphone, you will need to generate an app password that will work with your email client of choice. Select your smartphone from the list if this applies to you; otherwise, press Next.
On the next screen, Microsoft will helpfully tell you that you may need to set up app passwords for other apps and services that rely on your Microsoft account. Read this page and click Finish to move on.
To create an app password, go to the Security info page and click the Create a new app password link under the App passwords heading. Jot down the password it generates, and enter that into whichever app you need it for. Each app needs its own app password, so if you need more, click Create another app password to your heart's content.
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