Can't Control UI with Controllers

Hi All,

I hope this isn’t a silly question.
I only start learning UE5 properly a few days back, with the help of some YouTube tutorials and documentation hunting but I’ve hit a snag.

I can’t seem to control my UI with controllers, at least not properly. Once the demo gets going, everything’s alright and the UI responds to the ‘start’ button at least, to pause the game. Other than that, I can’t use the controller to do anything on the UI and I’m not sure what I’m missing.

Here’s my Controller BP:

Here’s the main menu BP and functions:

The selection box variable is the vertical box currently holding my buttons:
image

To add a little more: When I enter the settings and come out, the UI reads an input from the controller after which it just stops.

Is there something fundamental that I’m missing?
Thanks for your time.