Select the Start button, and then select Settings. Select Accounts. Select Email & accounts. Under accounts used by mail, calendar, and contacts select the account you want to remove. Then select Remove. Select Remove to confirm.
How do I remove my Xbox account from my Microsoft account online?
To remove the wrong account, select the Start button and select Settings. Select Accounts. Select Email & accounts. Select the account you want to remove. Select Manage. Select Delete account from this device. Select Delete.