Managing personal Outlook.com account settings, security, and privacy
Hi Greg, yes, this can happen. Microsoft accounts are identified by the full email address, not only the username before @.
So ******@hotmail.com, ******@live.com, and ******@outlook.com can be different accounts if they were created separately. If the recovery email and phone number are different, it usually means they are separate Microsoft accounts, not aliases of the same account.
You can check aliases on the account you can access here: https://account.live.com/names/manage