Login Catch-22: locked out of Work account due to MFA mismatch.

"I am the owner of the domain mydomain.be, registered at one.com. I have a Microsoft 365 Business Premium subscription. I am locked out of my work/school tenant admin account (mailto:email address removed for privacy reasons) due to an MFA issue — the Microsoft Authenticator is configured but not delivering push notifications, and the TOTP code length does not match what the login screen expects. I cannot access the admin center. I need to recover Global Admin access to my flavo.be tenant so I can manage users and licenses. I can prove domain ownership via DNS if required.