Multi-Factor Authentication ensures user identity using something you know, your password and something you have, a mobile device or hardware token.
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What you need to know about Multi-Factor Authentication. Commonly answered questions and answers.
If you would like to change your default sign in method for your Microsoft 365 Multi-Factor account, this is the Knowledgebase for you.
If you have a new phone, you will need to configure it to work with Multi-Factor authentication.