OnClick() for UI Buttons does not work [ANOTHER ONE]

Hi guys, sorry, i'm getting a little frustrated. I was following this course on UnityLearn
Recorded Video Session: Quiz Game 1 - Unity Learn
I've follow this step by step. I'm new to Unity so I would like to have some help. As the title says i cannot click on the button to give the answers. The strange thing is that i've made just another scenes for the game menu where i have to click to let it start. With the game scene instead the buttons don't work.

I've already searched online but some threads are to advanced. I read that i could have a canvas that blocks any interaction with button but i don't know how to make a test or what option to check. I've looked over all the functionalities but found nothing.

Buttons are created by a pool function.
Buttons are all interactable.
Buttons are all Raycast Target True (still do not know what that means)

Solved: I kept trying. I've looked at every panel. I had one that was not resized and was over the buttons.