"The media could not be loaded..." in training video

Course: Elasticsearch Engineer (On-Demand), Module 2, Lesson 3: Text Analysis

Question: Clicking Play on the training video associated with Module 2, Lesson 3 (Text Analysis) of the above course produces the following error: "The media could not be loaded, either because the server or network failed or because the format is not supported." I have been able to watch videos from the earlier Modules and Lessons without problems. Can somebody please advise? Thank you