Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Isabella ,
My name is Jackson and thank you for your question.
I sincerely apologize for the issue you experience with your account, I am a user myself and do not work for Microsoft so I understand how frustrating this is.
You can resolve problems using Microsoft Authenticator by following the troubleshooting steps in the link below to check both your device and the authenticator app;
https://support.microsoft.com/account-billing/a3a74493-566b-4c2e-b949-a2789bac0fd3
See details on how to add a work or school account to the Microsoft authenticator App in the link below;
https://support.microsoft.com/account-billing/43a73ab5-b4e8-446d-9e54-2a4cb8e4e93c
Warm regards,
Jackson E.