Sorry to hear that, but I have to tell you that a reset is unfortunately not possible without a support case.
Please contact us via the telephone numbers provided if you do not have access to a support portal as a registered user.
Link to the phone numbers as Business Customer https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
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