Hey there! Nice to meet you!
In addition to what the AI mentioned, the hacker was able to remove your Microsoft account's primary email address/security info, replacing it with the hacker's email address. This is why the system detects that you are using a different account with the same primary email address when signing in.
Since the security info has been replaced by the hacker, I'm afraid there is no other working method to recover the Microsoft account, and Microsoft Support cannot help either.
Thank you for your understanding.
Best regards,
Darhyl