Managing personal Outlook.com account settings, security, and privacy
Hi,
Unfortunately, if you're receiving the "Account does not exist" error, it usually means the attacker was able to change and remove your email address from the account. In that situation, the account has most likely been taken over, and recovery is unfortunately very unlikely.
I recommend following the steps in the Microsoft article below. If the issue persists after trying them, it is likely that the account can no longer be recovered.