I have taken over as Head of IT and am trying to migrate from on-prem Exchange to O365. The previous Head of IT had created a tenancy on his work email address (to which I have access) and linked the email domain to this tenancy. SSPR wasn't enabled so can't reset the password. I've had a ticket logged with MS for 22 days with no response or resolution.
Any ideas how I can progress this?
Many thanks in advance