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If you have access to a computer, you may be able to update your MFA configuration to include your new phone following steps outlined in this article. If you can't, you have to submit a request by opening a ticket to have your MFA reset.
Not every mail app on mobile devices supports Multi Factor Authentication (MFA). This article outlines which Android, iOS, and BlackBerry mail and calendar apps work with Microsoft Office 365 and MFA.
Some users reported that when accessing Security Info section on myprofile.microsoft.com to configure or update MFA authentication methods, an error message is displayed that says "An unexpected error has occurred."