Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Do this steps : https://learn.microsoft.com/en-us/answers/questions/5705995/tenant-lockout-only-global-admin-lost-mfa-authenti
- Contact Microsoft Support and clearly state:
- You are the only Global Administrator.
- You know the password.
- The issue is MFA/Authenticator lockout, not password recovery.
- There are no alternative authentication methods and no other administrators.
- You require tenant recovery / Global Administrator MFA reset.
- Request escalation for:
- Tenant lockout
- Global Administrator MFA recovery
- Ownership verification and MFA reset
Microsoft support guidance indicates that when no other administrator exists, Microsoft Support must handle the recovery after ownership verification