I used this url: https://login.microsoftonline.com/common/oauth2/logout?post_logout_redirect_uri='your_url'. And works perfectly.
https://login.microsoftonline.com/common/oauth2/logout? ... It should be normally logout all users MS Login Session then redirect me to ...
portal.office.com to login to E-Mail/Office 365. ACCESS TO WEBMAIL IMPORTANT: The address mail.dc.gov will NO longer work to access your DCPS email