Make sure the machine has product in it or it will bypass all the coins.
A choice-vends' auger system does use an "empty" switch that that will lock out that particular columns selection button, but it won't prevent the coinmech from accepting coins like in a Vendo with a serpentine rack delivery gate system. jumper pins 1 to 3 on the female "jones" socket with the coinmech removed/unplugged, & see if it will set the vending/credit relay & allow you to vend a selection.