Hey there @ridealto!
Unfortunately we do not disclose who owns a tenant.
If you can tell us the tenant name and your email on which we can communicate, we can open a support case for you. Then you will need to prove you owned the said tenant by telling us certain things about the tenant that only tenant admins have access to such as client secret, global client id etc. ← we will ask you about that after opening the support case.
Hope it helps!