You may need to bring the window over to the projector screen by dragging it to the right.
Try clicking on the embed from the projector. Be aware that there are some versions of PowerPoint on Mac that need an add-on to embed videos. Normally, this means dragging the window to the right. If you click the play button on your Presenter View, you will just advance the slide. If you wish to use Presenter View, be aware that this does make video playback a little clunky. Presenter view can be helpful because it gives the instructor a view of the current slide, a preview of the next slide, and the ability to read notes associated with the slides.
In PowerPoint 2013, 2016, 2019 on the PC and 2011, 2016, and 2019 on the Mac, by default, when you go to present your PowerPoint, the software will enter 'Presenter View.' This will automatically extend your desktop without telling you.
This article has moved to the new OIT Knowledge Base. (Moved) Video on my PowerPoint is not playing correctly.