Managing personal Outlook.com account settings, security, and privacy
Greetings!
This is Tin, I'll do my best to help. If you are trying to recover your alternate email account which is deactivated to recover your main account. It would be better if you will answer the Account Recovery Form instead and make sure to use an active email address to receive the reset password link:
Kindly open this link:
Under "where should we contact you?" please make sure to enter an email address that you have access with (this will be your future recover email once you recovered your account)
Please answer as many questions as you can and you can try to check your device where your account is still signed in as your guide.
Thank you,
Tin