Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
This is a critical security issue requiring direct intervention due to the lack of secondary Global Admins.
Your only resolution is through Microsoft's dedicated Data Protection Team.
Call Microsoft Support: You must contact the commercial Microsoft 365 Support phone line again.
Request Escalation: Immediately state you have a "Single Global Admin lockout due to lost Microsoft Authenticator device" and you require an immediate escalation to the Data Protection Team (DPT).
Security Verification: The DPT is the only team authorized to verify your identity (using company/domain registration proof, purchase receipts, etc.) and temporarily disable MFA for that Global Admin account (******@limsue.co.ug).
This process is slow and complex, but unavoidable. Keep calling and requesting the DPT until you connect. Once access is restored, immediately create a second Global Admin account and use the new phone to set up the Authenticator again.