A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
Hi @Andrej Milicevic ,
Since you are the only Global Administrator, your best option is to contact Microsoft Support https://support.microsoft.com/en-us/support/ and request an account recovery review. Open a support ticket through Microsoft's support channels or call Microsoft Support directly. Explain that you have lost access to your Microsoft Authenticator app and that there are no other administrators such as GAs in the tenant who can reset your MFA methods.
Be prepared to provide information that can help prove ownership of the tenant, such as subscription details, billing information, tenant name (<tenant>.onmicrosoft.com), and any verified domains associated with the tenant.
If you still have an active session in any Microsoft 365, Azure, or Entra portal, use it immediately to add a new MFA method before signing out. Otherwise, Microsoft Support is the only supported recovery path.