You’re using the wrong nodes. See above.
I, obviously, do not fully understand how it’s supposed to work but that’s the gist providing I understood the intent correctly.
Your spline is attached to the target, so it should be less janky than what’s in the anim above. Not exactly sure what’s the scope but perhaps this interact thing should belong to the player - so there’s only one rather than every thing in the world owning a widget + spline + logic. Consider the architectural implications before you finalise the mechanics.
Generally speaking, it’s the player who is the instigator who approaches and interacts => show the prompt => send message to the entity. However, you may be after something else, ofc - your mileage will vary.