When an action is greyed out, it means it's finished running. Get Raycast Hit Info fires once, then finishes. Typically a Raycast would trigger a transition to a new state where you get more info on the hit, then do something with that info (e.g., spawn an object at the hit point).
However, you have it setup in the same state as the Raycast. To work like this, the action would need an Every Frame option to keep running. I'll add that for this use case...
In the meantime, you can use a Next Frame Event to loop the state.
I'm not at my computer right now, so can't make a screenshot, but let me know if you need one...