Sending, receiving, and organizing email in Outlook.com
Hi,
I’ll be honest with you. If you changed your alias that ends in @hotmail, @outlook, @live, or @msn to a new one and deleted the old one, Microsoft has a policy that prevents it from being added back. Unfortunately, it is permanently lost.
For more details, please see the "Remove an email address" section here: https://support.microsoft.com/office/add-or-remove-an-email-alias-in-outlook-com-459b1989-356d-40fa-a689-8f285b13f1f2