I think you have to do it from the HT end, the chances of hitting the hole on the seat tube end is almost impossible.
I had forgotten the rage of the dropper post routing, it’s fine until it hits the underside of the linkage & you can see it, or get to it. I later found it it’s apparently possible to remove that whole section to make it easier, no idea if that was the case or not – eventually I managed to get it sorted.