Cannot get Image-based Touch Controller to Work

Folks,

I'm trying to implement a rather simple touch controller for my game. Below screenshot shows the hierarchy of my Canvas, where 'MoveControlGroup' is just an empty object to hold various UI elements and 'Forward' is Image that is supposed to be the touch controller to make the player move forward when it is pressed down:

Below screenshot shows the Inspector view of the 'Forward' image:

As you can see, I attached an Event Trigger that detects the 'Pointer Down' event, which should be equivalent to a finger pressed-down action and this event is tied to 'PlayerController.MoveForward' function. And the 'MoveForward' function only has one line of code in it as follows:

print("I'm moving forward!");

So, quite obviously, the expected end result is when I left clicked the image-based controller and keep the mouse button pressed down, I should see the "I'm moving forward!" message being printed in the console. But I don't see a single instance of it.

I struggled with this for hours now and just can't seem to figure out what I could be doing wrong.

(By the way, this approach is based on Devin Curry's excellent tutorial on "Touch Input Buttons")