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See this FAQ for information on getting a fob. Fobs should be configured for only one account and should not be shared.
U2F token authentication only works in the Chrome and Opera browser.
The below instructions are for a U2F configured fob - the most commonly used fob.
Use a computer to browse to ninernet.charlotte.edu, don't use your phone.
Click Manage Account and login
These instructions are if you are already using Duo and have configured devices. If you are enrolling in Duo, see this FAQ for instructions.
Click Add or remove phones & tablets from the Duo Two-Factor Authentication section