There’s an issue (or feature depending on how you see it) in the new ST app automation builder. It doesn’t trigger based on “events” for presence sensors. E.g. it doesn’t trigger when someone arrives or leaves, but instead it checks for if someone is present or absent. That may be the reason why you aren’t able to get it to work using the Automation tool.
Alternatively, if you have access to RBoy Apps, try this app. One of the many features it to turn on a switch when someone arrives. It also has an option to turn on lights if it’s getting dark outside when someone arrives.