99 R1100RT

Am installing the Kisan Signalminder SM-5 module. Having trouble installing the connecting plug from the wiring harness. I have verified that the Kisan receptacle is identical to the BMW turn signal relay I took out. The harness connector has a cam lock.

My issue is it goes in for 1/8" or so then stops. I don't want to force it and break something so am wondring if there is a trick to getting this thing to set in correctly. I have unlocked the camlock and rotated it back, which is how I got if off. Any tips on this or am I just not pushing hard enough?