Hello @dan bull,
Thank you for connecting offline.
As we discussed, your issue relates to a tenant lockout situation where no other global admin in the tenant has the necessary admin rights to re-register MFA.
To resolve this, we need to involve our Data Protection team through a support ticket. Since you are unable to raise a ticket from your end, I have submitted one on your behalf. Please connect with our support team via the ticket, and they will assist you in resolving the issue.
I hope this information is helpful. Please feel free to reach out if you have any further questions.