A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
You'll need to follow the guidance for that product or service in order to recover that account. For office you can follow along here.
https://learn.microsoft.com/en-us/azure/active-directory/user-help/multi-factor-authentication-end-user-troubleshoot
--please don't forget to upvote and Accept as answer if the reply is helpful--