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If you are using a new device to multi-factor authentication (MFA), there are two ways you can remove your previous device from the authentication app:
- From a personal Microsoft account, go to the two-step verification area of your Account Security page and turn off verification for your old device.
- From a work or school Microsoft account go to the two-step verification area of your MyApps page or to your organisation’s custom portal and turn off verification for your old device.