Sole Global Administrator locked out by MFA (Authenticator no longer has the account): need the Data Protection team to recover access or cancel the subscription

I am the only Global Administrator of the Microsoft 365 tenant albertoasensio.onmicrosoft.com (admin account [Moderator note: Personally Identifiable Information removed]@albertoasensio.onmicrosoft.com).

When I sign in, the tenant asks me to verify my identity with the Microsoft Authenticator app, but the account is no longer present in Authenticator, so I receive no notification and no verification code. No other verification method (phone or email) is registered.

Because I am the only administrator, I cannot reset my own MFA, create a Temporary Access Pass, or open a service request from the Microsoft 365 admin center. I called phone support in Spain and they told me the case can only be managed from the admin center, which is exactly what I cannot access.

The subscription in that tenant is paid and still billing. I can prove ownership of the tenant (billing details, alternate contact details, domain verification).

Could you please engage the Data Protection team so they can verify my identity and either reset the MFA methods on my Global Administrator account, or cancel the subscription and close the tenant?

Thank you.