Thank you for posting this in Microsoft Q&A.
I understand that you are unable to complete MFA for your Azure account as you have lost your phone.
To log in to your Azure account, you need to satisfy the second-factor authentication.
If you have another global administrator, they can re-register MFA on your behalf.
For your reference: https://learn.microsoft.com/en-us/entra/identity/authentication/howto-mfa-userdevicesettings#manage-user-authentication-options
Based on the information you provided, it seems that you are the only global administrator of the account. In case you are the only global admin on the account and are blocked entirely, you can reach out to our support team. You can find support numbers for your country in the following article:
or creating a ticket through a different account: https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide#online-support
While creating a ticket with Microsoft support team. Give them the tenant ID which is locked out in your description. Tell them that no admin account has access anymore and your partners also have no access anymore.
Once you create a ticket with support team you will have to work with our data protection team. You will have to first prove your identity against your tenant for security purpose. Post that this team will help you with help you in getting access to your tenant or unlock your account depending on your scenario.
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.
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