does the spawn work at all? (Btw, what’s the 2D project template? is it the 4.3 preview 2D Side Scroller, or just Side SCroller?)
Try do simple things first, like click and spawn your wall_sconce at specific location. (say at 100, 0, 0)
After make sure spawn works, then try print out the location you get by hit location, and then pass the info to spawner.
btw, your bp attach 4 will never work because it requires both touch and mouse click.
(specifically, it requires left mouse button pressed once, and then use touch input as source. )