Why is my PowerPoint presentation not playing embedded videos?

Ensure powerpoint slides are compatible with the device the presentation is being shown on
E.g. Check that the Powerpoint version and encoding are supported by the platform
Check that the video codec used in the embedded video is supported by the presentation platform
E.g. Do some research to determine the most popular types of codecs on the platform
Download any necessary codecs to successfully embed the video
Check if the video file is too large and if compression is necessary
Look for any settings that might impact the playing of embedded videos