사용자가 구독, 계정 설정 및 청구 정보를 관리하는 데 도움이 되는 Microsoft 365 기능입니다.
Hi! My name is Aj and Im an Independent Advisor here to help!The right step is to contact your school or IT administrator and let them reset your multi-factor authentication. Once they remove the old registration, you will be able to sign in again and set up Microsoft Authenticator on your new phone.
You can also check this link for reference