Hi @ATB
Looks like the issue is more related to your account, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client.
What is your account type? If your account is a outlook.com account, you can use this document to unlock your account: https://support.microsoft.com/en-us/office/unblock-my-outlook-com-account-f4ad2701-d166-4d8b-8a6a-9af2a1f8a4c4.
Alternatively, you can fill out this form to recover your Microsoft account:
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