Hi Harry,
As this is security related issue, I will suggest you to quickly call up the global helpdesk numbers as per your location and describe your issue, prove the tenant owner is you with some valid IDs and mail address, custom domains that you own. This will allow the support desk to pass on to the relevant backend team . https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
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