Hi
Just got a di2 st-r8060 brake and when I pull the brake wire through the end of the cable just goes all the way and end up right by the outer cable. It is like the wire end is not big enough. So when I pull the brake nothing happens.

I am pretty sure it is something very simple by I can't figure out what it is I am doing wrong.

I am using the org. Shimano cable that came with the brake.

Going out of my mind.......