Managing personal Outlook.com account settings, security, and privacy
Hello, thank you for reaching out to Microsoft Q&A.
Could you please clarify the email addresses involved?
Is @outlook.com the Microsoft account you are trying to sign in to, and is your Gmail address the email account where Microsoft is sending the verification code?
May I please know when was the last time you were able to sign in with your Microsoft account (**@outlook.com) successfully?
Please note that if you haven't signed in with your Microsoft account for more than 2 years, your account will be put into an inactive state and will be closed. You cannot even use the account recovery form to regain access to your account.
So, if you haven't signed in with your @outlook.com account for more than 2 years, it would have been permanently deleted. Also, due to security reasons, Microsoft no longer allows the recreation of email address that is being deleted.