![]() You only have to scan the QR code once on a device. That code is valid as the second form of identification for just a few seconds before the authentication app refreshes it. Once you do, the authentication app gets to work by issuing an ever-changing unique code. Without fail, one of the easiest ways to begin using 2FA is by using your smartphone's camera and scanning a QR code provided by the company or website. Why you can trust TechRadar We spend hours testing every product or service we review, so you can be sure you’re buying the best.
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