It worked for me on the amazon fire stick a few weeks ago, but has since stopped. They are constantly changing things in an effort to stop people getting the video stream onto a large tv screen.
Tablets/phones and laptops/pcs are the safest bet making sure the operating systems and web browsers are up to date. If one browser is not working then try another e.g. chrome, firefox, edge/IE
I shut the page down , started again , got pictures but the wrong commentary so went to listen and changed commentary, came back to watch it and the white circle greeted me !!!!