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You may occasionally see a message in the Duo Mobile app asking you to reconnect your account. This typically happens after switching to a new phone with your existing number, or following a software update that requires a security refresh.

The quick way to fix this is to:
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Go to multifactor.newschool.edu
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Click the Enroll/Manage My Devices button at the bottom of the webpage (you may need to scroll down)
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Enter your NetID email and New School password
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When prompted for Duo, click the Need Help? Link

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Select the Activate Duo Mobile under the I have a new phone option

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Confirm your phone number and click Text me a Link
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On your phone, click the link that is texted to you to reconnect the Duo mobile app
Once you have successfully reconnected to Duo, you will see that Duo Mobile is active and not grayed out.