I have this problem as well. I’ve tried executing the console command in different places, setting user settings and I’ve tried all three modes (fullscreen, windowed fullscreen and windowed) and nothing will play the game on top of the task bar. Absolutely nothing I can find on here or elsewhere on the internet provides a solution.
This is very frustrating, especially since it’s obviously possible or any number of UE4 games I’ve played would play with the taskbar visible.
PS MainFrame.ToggleFullscreen doesn’t do anything.