Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello @Joseph Norman,
Based on the information you shared, I understand that you are experiencing an issue with your Microsoft Authenticator app, which is not functioning as expected, and you currently do not have an alternative MFA method configured (such as phone or email).
If you are part of an organization, I recommend contacting your IT Administrator directly. They can reset your MFA settings through the Microsoft Entra admin center.
If you are the sole user or administrator of the tenant, or if this is a personal Microsoft account (for example, when signing in via office.live.com), you will need to contact Microsoft Support. Specifically, the Data Protection team can assist in resetting your MFA. Please use the following page to locate the appropriate Microsoft support hotline and reach out to the frontline support team so they can raise a ticket on your behalf: Customer service phone numbers - Microsoft Support
Please note that this is a user-to-user support forum. Only Data Protection team can help you to revoke the session and reset your password, account, MFA...
Feel free to let me know if there are any updates or if you have further questions regarding this issue.