Issue with DUO - New Phone

If you have a new device, but kept the same number, you can update it by clicking on My Settings & Devices on the Single Sign-On Services page.
You can authenticate into Duo with a phone call or a text message code to edit your settings..
Then click on the device option next to the phone you want to modify.
Then click Reactivate and scan the QR code with the Duo App.

Duo on a new phone