We have a customer who setup an Office 365 trial using a certain name for the tenant (i.e. companyname.onmicrosoft.com). The trial has long since expired but the customer now wants to kick off their production tenant and use the same name (until they redirect their live domain to it). However they are being prevented from entering the name as their Microsoft Online Services Company Identifier. Given the trial is no longer available we also can't login and do anything.
Any advice would be greatly appreciated.