@Prenota Fácil
Thank you for posting this in Microsoft Q&A.
I apologize for the inconvenience. You can follow below instructions to get correct support numbers.
If you are the only admin on the account and are blocked entirely, you can reach out to our support team. You can look into below article to get support numbers depending on your country.
https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Note: Please dial the number specific to you region to reach our customer support.
Once you reach our support team you can ask them to create support ticket as you are unable to login to portal. 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.
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
Let me know if you have any further questions.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.