I suggest trying to eliminate some points of failure. You could try to hook this up to “key w” for instance, or simply on a tick with a preset value, to ensure that the rest of the thruster code etc work. Also check the mobility of the root component of the actor you’re moving is not “static” but “movable”.
After those are confirmed to work, you need to figure out why the axis input isn’t being triggered. Maybe a comparison to the rolling ball template would help (it uses “auto possess player”, not “auto receive input”).