Some pics might help 👍
12mm hex key, isn't it? (Not entirely clear what meant by "got the hub off" and "it".)
I would have thought that once you take the end cap off, the axle is pressfitted into the bearings inside so you just tap it out. Just a guess.
View: https://www.youtube.com/watch?v=5BSl5sXdz9Y
Ok this is the video you want to watch. Go to 55 sec.