I can confirm I have Fed Govt users who are now complaining of this issue. They are not always allowed to use other browsers. What is link to the "unsupported browsers page" for GTW that i can point them at to offer alternatives.
Taking support away from IE11 without some extra communication to users is a bummer. We have SO. MANY. FED AND STATE GOVT EMPS who attend our webinars.
If you were to say, but they should move to Edge or Chrome - believe me WE ALL KNOW THAT. But it can be a sloooow process. I confirmed with several folks that their orgs actually allow them to move to Edge but they hadn't/didn't know that...
If they can't use IE, then lots of my customers will not be able to attend webinars. Our state agency computers can use only IE on the older computers and Edge on the newer ones.