Sending, receiving, and organizing email in Outlook.com
Hello
How did you change it from hotmail.com to outlook.com? Did you add outlook.com alias then delete the old hotmail.com alias?
If so, that alias is gone and cannot be recovered, unfortunately.
Microsoft explains it here: https://support.microsoft.com/office/add-or-remove-an-email-alias-in-outlook-com-459b1989-356d-40fa-a689-8f285b13f1f2 Under the section "Remove an email address", it says: "Are you sure? If you remove an alias that's an email address from a Microsoft domain (like @hotmail.com, @live.com, @outlook.com, or @msn.com), you're permanently deleting the alias and it can't be associated with any Microsoft account again."