Thank you for your post!
From your conversation with @Carlos Solís Salazar , it sounds like you don't have access to the Authenticator App, no other authentication methods set to complete MFA, and no other users or Global Admins within your tenant. Because of this there's nothing we can do when it comes to getting you access to your Azure AD tenant.
If you do require/want to delete this tenant since it's "empty", I'd recommend working closer with our support team via their customer service number for your country/region or through an Azure support request, if you have another tenant to create this in, or you can reach out to our Azure Data Protection team for further assistance - (866-807-5850).
For future reference, I'd also recommend creating and managing an emergency access account in Azure AD, this will help prevent being accidentally locked out of your Azure Active Directory (Azure AD) organization because you can't sign in or activate another user's account as an administrator.
I hope this helps!
If you have any other questions, please let me know.
Thank you for your time and patience throughout this issue.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.