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Microsoft Exchange Online
A Microsoft email and calendaring hosted service.
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Just wondering where did you find out that your organization is suffering from a password attack? Maybe you can share the screenshot after removing all privacy information like domain name and email addresses.
In addition, since October2022, Exchange Online has been deprecating Basic Authentication. Therefore, this brute force attack or password spray attack should not be the same as the information in the link you provide.
About Azure AD accounts being locked out，You can refer to this document to manage smart lock values：
Prevent attacks using smart lockout - Azure Active Directory - Microsoft Entra | Microsoft Learn
Hope this helps!
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