This issue was resolved.(READ MORE)
We are aware that some users received “Your connection is not private” warning while trying to access Office 365 employee email using Outlook on the Web (OWA). The issue appears to be related to using the mso365.gmu.edu link to access email.
If you are experiencing this issue, please try either using http://mso365.gmu.edu or http://outlook.com/gmu.edu to access your Office 365 employee email.
Engineers are working on this issue. We apologize for the inconvenience this might have caused you.
This issue only impacts Office 365 employee email users using Outlook on the Web (OWA).June 12, 2020 10:00 a.m.