Sole Global Administrator lockout (MFA registration loop)

I have a Microsoft 365 Business tenant. I am the sole Global Administrator and I am locked out because of an MFA registration loop. There is no other administrator who can reset my MFA.

Microsoft support has already reproduced the problem and I already have case #2607281420001653.

• Microsoft Authenticator is already registered and visible under Security Info.
• The Microsoft 365 Admin Center and Entra Admin Center continue to redirect me into a broken MFA/security-information registration loop.
• SMS and telephone verification fail.
• Multiple browsers, Incognito/InPrivate sessions and MFA registration URLs have already been tested.
• The issue therefore requires escalation beyond ordinary client-side troubleshooting.

I do not need another first-line troubleshooting session involving browser clearing, Incognito mode, aka.ms/mfasetup, mysignins.microsoft.com/register, SMS verification or telephone verification. These steps have already been performed repeatedly and the failure has already been reproduced and documented by Microsoft.

I need this case transferred to the Microsoft Data Protection Team / Tenant Recovery team.

I called my local support line in Greece (2111813880) but I could not speak to an ageent and the automated message kept directing me to aka.ms/mfasetup (which I tried and does not work).

This has remained unresolved for more than 1.5 months. Unacceptable.