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Resetting a user's MFA details requires the user to re-register at next log-on. To complete this task, you must have appropriate Office 365 administrator permissions. This article shows how an administrator can reset a user's MFA details, enabling the user to then set up new MFA details at their next log on. However, if this is not completed prior to decommissioning the old device, then administrator assistance will be required to reset the user's MFA details. Individual users may manage their own MFA settings using the online portal at. A resultant change to MFA details is therefore required if the user is to continue to enjoy access. This is likely to impact MFA and so prevent access to the user's computer. Over time, a user may lose or replace an authenticator device or perhaps move to a new mobile phone number. Multi-factor authentication (MFA) is an authentication method in which a computer user is granted access only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism. Make sure you use something other than your Microsoft email address for your alternate email address.Resetting an Office 365 user's MFA details To update your mobile, phone, and alternate email address details, select Change. In the Security info tab, select Add Method > Phone > Alternate Phone or Email to add details. In the header, select your profile icon > My account > Security Info. The alternate email address is used for important notifications, such as resetting your admin password (not your computer admin password).īrowse to the Microsoft 365 admin center. Use the Security Info page to change your mobile phone number and alternate email address. To update your phone number and email address If you're looking for how to change your company's profile information, such as company name and address, company phone number, and technical contact information, see Change your organization's address, technical contact email, and other information.įor more information about changing user contact information or removing former employees, see Related content. This article explains how you, the admin, can change your business phone and email address in Microsoft 365.