https://www.windowscentral.com/windows-10-connectivity-bug-hits-worst-possible-time-outlook-teams-office-365
Windows 10 connectivity bug hits at the worst possible time for Outlook, Teams, and Office 365 | Windows Central
Microsoft recently issued a warning to people about a Windows 10 bug that prevents Office 365, Microsoft Teams, Outlook, and other apps from connecting to the Internet. The bug affects people using a proxy connection or VPN.