If you are connecting to the bot's user using Remote Desktop, you need to disconnect from the session using AlwaysOn, so that the user session goes to the computer's console session.
When Windows does not recognize that the session as visual, it does not render anything, which means that no app windows will be visible.
You can confirm this by using the printScreen
command, which should generate a completely black image, precisely because the session the robot is using is not visual.