Skype for Business Web App freezes

Skype for Business Web App freezes right after starting

I see the following error message: "Loading the Skype for Business Web App Plug-in has timed out or failed. If the problem persists, please restart the browser"

Reinstalling did not help me.

I am using Microsoft Windows x64 with latest updates (365 subscription). I have never used Skype for Business Web App before and tried to install it today for the first time, but as you see it is not working.