Employee Two-Factor Authentication (2FA) Last updated Save as PDF Share Share Tweet Share Duo Security is IWU's two factor authentication (2FA) tool of choice. Learn more about Duo, what two factor authentication is, and more using the links below. Getting StartedArticles in this section pertain to general help and setup of Duo Security. If you don't know where to begin, start here.Adding a Landline or Non-Smartphone to DuoAdding a Secondary Device to DuoHow to change the default Duo authentication methodDuo SecurityInitial Setup of Duo SecurityFrequently Asked QuestionsAll commonly or frequently asked questions about Duo Security and Duo Mobile.Can I use a hardware token / security key as my second factor?I'll be traveling overseas, what do I do about Duo Mobile/Security?I got a new phone, what do I do to set Duo Mobile/Security up?I setup my smart phone for calls/sms with Duo, but didn't activate the Duo Mobile App. How do I activate it now?What's the preferred method for two factor authentication? (SMS, Voice, Duo Mobile Push)What do I do if my 2nd factor is offline? (i.e. Phone is dead, or lost)What is Two Factor Authentication, and why do we need it?Additional GuidesThis section contains additional helpful articles for use after you've successfully setup Duo.Re-Activating Duo On a Mobile DeviceSetting up Duo Restore