There is no option to remove MFA for a user without logging in to Azure AD.
In this situation only Global admin can login to Azure AD portal and make necessary changes to your MFA.
They can disable MFA for your account or they can also make your account re-register for MFA.
Since you have lost access to the authenticator app, you can ask global admin to perform below actions,
Global admin can perform this by accessing Azure portal and your user account within Azure active directory.
Global admin can perform this by accessing Azure portal and your user account within Azure active directory.
If you are the only global admin on the account and are blocked entirely, you can reach out to the Azure Data Protection team to restore access. 866-807-5850
Also, for the future, you can create an emergency access account (break glass) in Azure AD. This account will help prevent being accidentally locked out of your Azure Active Directory (Azure AD) organization because you can't sign in for any reason.
https://docs.microsoft.com/en-us/azure/active-directory/roles/security-emergency-access
Some other support option include;
azcommunity@microsoft.com
or creating a ticket through a different account: https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide#phone-support
Let me know if you have any further questions.
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