‘19 Platinum Tekonsha P3 install question

Hey all, I used the search, but wasn’t able to find my exact question. Forgive me if I overlooked it.

So I’ve got a ‘19 Platinum. I put in the aftermarket plate that holds the controller and moved all buttons over to it as well. I removed the factory brake controller and now that plug-in is hanging empty. I’m grounded and connected into the back of the Tekonsha controller with their new harness. I’ve now got the big plug left to plug into my truck’s factory harness.

I’ve watched the videos showing the blank behind the the driver’s kick panel. My truck doesn’t seem to have that plug taped up in there anywhere. Any ideas where I can locate it? Has anyone run across this?

Thank you in advance!

-Cody