Did you update to Windows 10 2004?
https://social.technet.microsoft.com/Forums/en-US/4c8654be-d3da-4611-a649-110ca5a7c70a/ncsi-taskbar-icon-may-report-quotno-internetquot-on-windows-10-2004-devices-that-do-have?forum=win10itpronetworking