Hey Jack:
I am wondering if you removed the
KNOCK OUT from the disposal dishwasher connector??
Here, you need to take a flat screwdriver or similar and you need to "knock" the plug out of the disposal inlet for the dishwasher.
Read the instructions over again...should show you how to do this.
Let me know if you did this already...and then will try to come up with other ideas (there are a few...

).
Otherwise, that should get you up and running.
Mark
.