How does MFA work when I get a new phone?

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How to set up O365 MFA on a new mobile device

Posted on 31 October 2023 by Beaming Support

Multi-factor authentication – MFA – is now commonplace across businesses of all sizes. Many choose to use their phones as their authentication method, whether that be via SMS, a phone call, or through an authenticator app.

This raises the question: how can I change my MFA method when I get a new phone?


Contact your MSP

Firstly, your nominated IT contact will need to get in touch with your MSP on your behalf. As MFA is a security concern, your ISP will verify that you are who you say you are, then remove your old device from the MFA list. They will then require you to provide contact details for your new device.


Logging in to M365

After your MSP has reset your MFA, next time you attempt to log in, you will be prompted to add your new device. Microsoft 365 will show step by step instructions on how to add your MFA method(s) to your new device.