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#31
It's a one time deal, not every time. Once you do it you won't have to do it again until you reinstall Windows on that device. Entering that code makes that device a trusted device. Once that's done sync settings etc are unlocked so you can sync passwords etc across your other devices that you log into with that Microsoft ID. It's an extra precaution so somebody can't pretend to be you and steal web site log in info etc. It's not hard to guess some e-mail addresses etc.