Facebook is having issues with their live streaming. It has been working for some clients and not at all for others. Below are a couple things that you can try
1.) Some clients have been able to get the live stream to work by editing their broadcast and re-entering the facebook destination under the publishing tab.
2.) Wait it out. Clients have said that Facebook Live works, but the video will show up 10-20 minutes after starting your live stream on Boxcast.
3.) Let your viewers know about your other viewing options by writing a post on your Facebook timeline.