My Xbox profile/gamertag appears to have been transferred to a Microsoft account I do not own.

Based on the available support guidance, once a Microsoft account has been compromised and the attacker has changed key account associations (such as linked profiles, aliases, or security info), recovery is only possible through the official hacked-account and account-recovery flows. If those automated processes fail, there is no additional escalation path that can manually restore the old associations.

For a compromised Microsoft/Xbox account, the supported steps are:

1. Follow the hacked/compromised account recovery flow Use the official guide for hacked accounts and complete all steps, including malware checks and password changes:
   • How to recover a hacked or compromised Microsoft account
   • Run a full antivirus scan first.
   • Change the Microsoft account password to a strong one.
   • Review account settings (connected accounts, forwarding, automatic replies) for any attacker changes.
2. Use the Sign-in Helper and account recovery form If the Xbox profile was moved to another Microsoft account and normal sign-in or security info no longer matches, use:
   • The Sign-in Helper for hacked account issues: Open the Sign-in Helper for support options or hacked account issues
   • Complete the account recovery form with as much accurate historical information as possible (old passwords, services used, etc.).
   Community and moderator guidance states that if the recovery form fails and security info has been replaced by the attacker, the account (and associated services like Xbox/Minecraft) is considered unrecoverable, and Support cannot override this automated decision.
3. If security info change is pending If the account shows a “security info change is still pending” message, use the links on that screen:
   • “Cancel this request” if the change was initiated and the old security proofs are still accessible.
   • “Let us know” if the change was unauthorized, to route through the unauthorized-change flow.
4. Contact support through the official channel (if the form succeeds or more help is offered) When the Sign-in Helper or hacked-account guide offers contact options, use those to reach a support agent. Community guidance indicates this is the only supported way to reach a real person for these issues; there is no separate manual path to reattach an Xbox profile once it has been moved and the automated checks fail.

If all of the above flows (hacked-account guide, Sign-in Helper, and recovery form) have already been tried and repeatedly failed, current guidance indicates there is no further supported method to restore the original Xbox profile to the original Microsoft account.

References:

• How to recover a hacked or compromised Microsoft account
• Hello , welcome to Account help & learning
• Help with "phone number is already used" in a Microsoft account
• My account got hacked. - Microsoft Q&A
• my microsoft account has been compromised - Microsoft Q&A
• Need help with hacked microsoft account - Microsoft Q&A