URGENT: Sole Global Admin locked out by MFA - Data Protection escalation

Disclaimer: I will answer you in English based on your previous message. As a friendly suggestion, posting in Spanish may help your question reach a wider audience and increase the chances of receiving assistance from other community members.

Dear Italo Grilli,

As the tenant is locked out and the only Global Administrator cannot access the Microsoft 365 Admin Center, you will need assistance from the Data Protection Team to verify ownership and help restore access to the tenant.

I understand that you have been unable to reach Microsoft Support from Argentina. Please try the steps below once more.

For a full list of regional numbers, you can also visit this official page: Customer service phone numbers - Microsoft Support. The support team will assist you as soon as possible. 

If you can reach Microsoft by phone, use the official Global Customer Service phone numbers list. Choose your region > your country > if your country lines fail or lack English support, select a nearby country or the United States number, Microsoft explicitly allows this.

To help you navigate the automated phone system (IVR), here’s an example of how the conversation might go:  

IVR: What kind of problem are you concerned about?   
You: Multi-Factor Authentication (MFA) 
IVR: What kind of product do you use?   
You: Office 365 for business  
IVR: Education or business account?   
You: For business  
IVR: Are you an administrator?   
You: Yes  
IVR: Do you have another administrator in your organization?   
You: No  
IVR: Do you need a service request?   
You: Yes  

This should help you get connected to a live support agent who can assist you directly.  

Note: Sometimes, you would hear the computer-generated voice at first, please kindly wait for it to end, and if an agent is available, you would be directed to them and get your support. During peak hours, there might be high call volumes, so we kindly ask for your patience as we work to assist everyone as quickly as possible.

If phone support does not work, you can create a temporary Microsoft 365 trial tenant and use it to raise a support request with the Business Support team. This temporary tenant will allow you to access the support channel, provide proof of ownership of your original tenant, and request assistance with regaining access.

• Go to Compare Office 365 Enterprise Pricing and Plans | Microsoft 365
• Select any plan and click Try for free.  
• Complete the setup to create a new tenant.  
• Once the new tenant is created, navigate to: https://admin.microsoft.com/AdminPortal/Home#/homepage
• In the left-hand navigation menu, click on "Support" and then "Help & support." 

Important: Please remember to cancel the trial subscription once your issue is resolved to avoid any charges.  

I hope these steps will help resolve your issue. If you need further assistance, I am always here to help.   

Thank you for your patience and understanding. I appreciate your continued trust. Hope you having a nice day and really much warm regards to you as well!