Hi, I'm John! I will help you with this.
Unfortunately, for security reasons, Microsoft does not allow the reuse of Microsoft usernames or emails that use their domains, like @outlook.com, @hotmail.com, or @live.com, even if the original account is no longer accessible.
Your best option would be to create a new Microsoft account with a different username. I know it’s not ideal, but this ensures your account stays secure and prevents any potential misuse.
I really hope this information is helpful! Let me know if you have any further questions or concerns.
Regards,
John J.D.