GUI Not Showing when interacting

I've got a script setup to interact with objects/NPCs and have found the interaction to be working, but when trying to make a simple GUI to show when interacting with the object, it will not show. Here is the code I'm using. From what I've looked up, t$$anonymous$$s appears to be the correct way to show GUIs.

 public class bandido2 : Actor {
     
     public bool showGUI = false;
     
     void onInteract()
     {
         showGUI = true;
         Debug.Log ("Trying to show GUI");
     }
     
     void OnGui() {
         if ( showGUI == true )
             GUI.Box (new Rect(10, 10,300, 400), "Greetings, it is nice to meet you!");
     }
     
 }

The interacting is working properly and going to the console, however the GUI doesn't even so much as flash across the screen.

What am I doing wrong here?