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Log in to the My Cal Poly portal.

Go to the Personal Info tab > Personal Info > Authorized Devices > Multi-factor Authentication > click Edit.

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Click Other Options.

You’ll be prompted to authenticate now, do not respond to it. Wait until step #6 to authenticate instead.

Select Manage devices. This is located at the bottom of the list.

Choose the phone number you wish to reactivate from the drop-down list, then select an authentication method and complete the verification on your currently enrolled device.

Once authenticated, you will see a page that lists your devices in square cells.