Kia ora, i wonder if the LineTraceByChannel node is even firing. I recommend that you change the option on this node, labelled Draw Debug Type to the value of Persistent. Then when you play the game and press the E key you should see red lines coming out of your character and hitting the door. If not then I think there could already be an event node somewhere that is consuming the E key being pressed and therefore stopping the event node that is connected to the LineTraceByChannel node from firing. You can change Event nodes so that they don’t consume the keyboard input, so that you can have multiple event nodes processing the press of a single key on the keyboard. To do this click on the Event node and in the Details panel untick Consume Input.
Your key mappings are in the Project Settings under the input section. Any blueprint could potentially have an event to process the E key.