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Open a browser (preferably Chrome or Firefox) and type in portal.office.com as indicated below.
Click on the ‘your account’ button in the right-hand corner as indicated below.
Select ‘Sign out’, as indicated below.
Once you've successfully logged out of your @mail.valenciacollege.edu you may navigate back to the home page of the TeamDynamix portal and sign in (at the top right of the page) with your @valenciacollege.edu account.