Microsoft 365 Business – Sole Administrator Locked Out in MFA Authentication Loop

I am the sole Global Administrator of my Microsoft 365 Business account and have been locked out since replacing my iPhone.

Issue:

My password works, but Microsoft Authenticator did not transfer my credentials to the new phone.

The app displays “Sign in to add your account.” However, when I attempt to sign in, Microsoft requires me to authenticate through the same Authenticator app I’m trying to set up, creating an impossible authentication loop.

Both available verification methods require access to my previous Authenticator credentials, which I no longer have.

Troubleshooting attempted:

• Tried both available MFA verification methods.
• Followed Microsoft’s Authenticator recovery instructions.
• Attempted account recovery and Admin Center access.
• Submitted an MFA reset support request on November 10, 2026.

My support case was assigned Severity C, but I have received no response in the expected timeframe. Phone support only provides automated updates.

Question:

How can I get my existing case escalated to Microsoft’s Data Protection / Tenant Recovery team?