AADSTS5000224 — existing tenant inaccessible and Azure support portal blocked

I previously had access to an Azure tenant containing existing resources. Sign-in now fails with AADSTS5000224: “The tenant you are trying to access has been deauthenticated and is no longer available.”

Signing in directly to the original tenant produces the same error. The Azure support request entry point also fails with this error. I need to restore access to the existing tenant, not create a replacement.

Could a Microsoft moderator provide a private support channel to verify ownership and investigate whether tenant authentication can be re-enabled? I can provide the tenant ID, trace ID, correlation ID, and timestamp privately.