I think due to security reasons it will be difficult to request help for someone else's account. We have a different forum where these issues are supported. You can contact us for support using the form or access the Microsoft Answers Community who can help you further . I would suggest you to check the recovery options at the links below and it can help for your acquaintance .
https://support.microsoft.com/en-us/account-billing/you-can-t-sign-in-to-your-microsoft-account-475c9b5c-8c25-49f1-9c2d-c64b7072e735
https://support.microsoft.com/en-us/account-billing/help-with-the-microsoft-account-recovery-form-b19c02d1-a782-dee6-93c3-dc8113b20c42
Hope this helps. I would suggest you to request assistance in the Microsoft Answers forum as well and someone may be able to help you further on this.
Thank you.
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