Hi,
XBOX is currently not supported in the Q&A forums, the supported products are listed over here https://learn.microsoft.com/en-us/answers/products (more to be added later on).
You can ask the experts in the dedicated XBOX forum over here:
https://answers.microsoft.com/en-us/xbox/forum
Also something here might help:
Secure your account if you think you’ve been hacked
https://support.xbox.com/help/account-profile/manage-account/compromised-account-solution
(Please don't forget to accept helpful replies as answer)
Best regards,
Leon