Hi, John
Good day!
Thanks for posting into our community.
According to your description, I understand how frustrating this situation can be.
First of all, would you please allow us to if you can get in touch with the other administrator of your organization? If so, please ask the other administrator and reset the MFA for your admin account - Set up multifactor authentication for users - Microsoft 365 admin | Microsoft Learn. Once changed the other authentication method which will allow you to login your account.
Or you could not contact the other administrator, in this situation, the final option for you to contact Microsoft Data Protection team directly. Unlike our forum team, Microsoft Data Protection team with higher permission and would be able to reset it on the backend for you.
Please be kindly to refer - Find Microsoft 365 for business support phone numbers by country or region - Microsoft 365 admin | Microsoft Learn. (Ctrl+F4 and type your area's name.) They can guide you through the steps and help you regain access to your account
Thanks for your precious time and your understanding would be highly appreciated.
Hope you all the best!
Microsoft Community Moderator.