We decided to make these non domain machines these will display on our tv's. I did get this to work and appreciate you sending me the structure to build from.
START "C:\Program Files\Microsoft Office\root\Office16\powerpnt.exe /s" "c:\_Lobby Slides\TV Lobby Slides for June.ppsx"
Next Question is how to make this run automatically when the file name changes every month depending on the month without intervention to change the file name in the script each month. Is there a way to have it run the latest .ppsx in the folder with monthly intervention?