Simplest option may be to add a new email alias to the account (account info\email addresses)
https://account.microsoft.com/profile/
then add a new user account to windows.
https://support.microsoft.com/en-us/windows/add-or-remove-accounts-on-your-pc-104dc19f-6430-4b49-6a2b-e4dbd1dcdf32
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