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    How Do I Add a New Duo Device (Same Phone Number)?
    Instruction on how to add a new device with the same phone number to the Duo Authentication system
    Duo Two Factor Authentication First Time Setup
    How to setup Duo Two Factor Authentication for the first time.
    Duo Supported Operating Systems & Email Applications
    Details regarding email applications and iOS/Android versions that Duo supports.
    Duo Two Factor Security Tokens
    Instructions for purchasing and using a Duo security token.
    Using Duo Outside of the United States
    Information on using Duo internationally.
    Do I Have to Authenticate Using Duo Every Time I Check My Email?
    How to configure Duo so that you do not need to authenticate every time you check your email.