การใช้ Outlook บน Windows แบบคลาสสิกสําหรับการจัดการอีเมลส่วนบุคคล ปฏิทิน และที่ติดต่อ
Hi! Sorry to hear that you’re dealing with this. For a Microsoft account that was hacked and where you no longer have access to the old phone number, the first step is to try the Microsoft Account Sign-in Helper. If it sends you to the recovery form, complete it from a device and location you previously used with that account, and include as much Microsoft-account-related information as possible, such as old passwords, email subjects, contacts, Xbox/Skype/Outlook details, or billing/order information if any.
Unfortunately, connected third-party services such as Steam, a bank app, or other apps usually cannot be used by Microsoft as proof of ownership for the Microsoft account itself. Also, Microsoft support cannot manually change the phone number or bypass verification if the account ownership cannot be verified through the official process. If two-step verification was enabled and you have lost access to all verification methods, recovery may not be possible through support.
If you still cannot recover the account, the next practical step is to contact the third-party services linked to that email, such as Steam, your bank/app provider, and any other important services, and ask them to help you change the login email or recover access through their own account-recovery process.