Thank you for the information.
Kindly double-check if the account name was typed correctly.
If the issue persists, the error you are experiencing is an indication that your account was compromised. The hacker was able to remove the account's primary email address/security info and replace it with their own email address, which is why your account is not recognized.
Since the security info has been replaced by the hacker, I'm afraid there is no other working method to recover the Microsoft account, and request a refund. Microsoft Support cannot help either.
Thank you for your understanding! Please feel free to let me know if you need anything else.
Best Regards,
Darhyl