Not sure if this was reported or not as I was using IE11 on Windows 10 I noticed this message referencing IE10 and older. :) - for now I need to jump on Edge or another browser to use the site. It worked in IE11 on Win 7 by the way.
Old issue, check your compatibility settings. More details are here https://techcommunity.microsoft.com/t5/Community-Discussion/IE-V9-error-when-accessing-Tech-Communit...
Perhaps something new appeared, but my IE11 on Win10 works fine. More or less...
I've been using IE/Win10 with the Tech community from the get go, never had this issue. Had plenty others though :)