I were using the click image activity in my recent project. It worked well when the screen is on, but not worked when the screen is off. I had tried it within the launch workflow interactive, but it also not worked.
There’s two causes here, the first is that if you are running an Attended robot, they cannot work while the pc is locked or screens are off.
The other factor is that the click image activity cannot work in the background by default. It has an option called “SendWindowMessages” for background clicks, but it doesn’t work for all applications.