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                    What is two-factor authentication?
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                    How does 2FA verification work?
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                    Which 2FA apps are recommended?
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                    What should I do if I have lost my recovery codes?
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                    What happens to my login if I lose my smartphone?
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                    Can I set up 2FA on multiple devices?
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                    Can I change the 2FA method after setup?
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                    How can I restart the 2FA setup?