Hello @FL Install,
Welcome to Microsoft Q&A!
I'm sorry to hear that you're having trouble with your account. Please understand that in the Exchange Server online tab here we mainly focus on general issues related to Exchange Server and your issue is an account issue, so it is not within our scope.
However, I'd be happy to help point you in the right direction, it is recommended that you contact https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
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