Two-Factor FAQFind the answers to common 2FA questions. 2FA at NC State Learn More Duo Security Google 2-Step FAQ 2FA Training & Help Setup Am I required to turn on Two Factor Authentication? I manage a Google Generic Account. Do I have to turn on Two-Step for that? Can I use the same authenticator app with both two-factor services? Do I have to enter a code every time I want to log in? U2F USB Keys What is a security key? Which U2F USB security keys work and where can I get one? Are there limitations to U2F keys? Can U2F keys be reused for different users? Log-in Issues I got a new phone and now I can’t use an authenticator app. What do I do? I can’t use my usual second-factor method for Google 2-step, so how do I use another method? Why can’t I check “remember me” on the Duo authentication prompt? I can’t authenticate with Google 2-Step in some apps. Can this be fixed with App Passwords? How can I receive Duo codes via text message? Why am I not receiving push notifications? How do I turn off Duo Auto-Push? Misc. Questions Does Two-Factor cost money? Two-Factor outside the USA Do I have to use my personal phone to receive or generate codes? I need more help. Is there training available?