I am using the release version of Powerpoint 2016 (16.0.4229.1024) with Office 365 Home under Windows 10 Pro 64-bit. When I embed a 'video on my PC' it will not play if displayed on a secondary monitor or a projector. If I change Slide Show/Monitor from Automatic to Primary Monitor then they do play. I have tried MP4 and MOV videos and neither play on the secondary monitor. I have tried clicking on both the video on the play button. They all play on the secondary monitor if run the same presentation under Powerpoint 2013 and they all play if I double click on the file under Windows (using 'Films &TV').