I have a BigHorn which did not come with keyless and go from the factory in 2018. I added it myself using instructions from this site. It uses all OEM components, functions and looks exactly like a factory system. When I programmed fobs to the system the directions I followed had a RF Hub reset step.
Below is quoted from this website under “How to add factory keyless enter n go” by jimmy07
“Now we’re ready to program the new fob and hub. Close the driver door and open it to wake up the bus. Confirm that the BCM took the settings from earlier, as the EVIC should display press brake + start button. Fire up the alfa and connect to the RF Hub. Set the new fob on the center console lid. Click the car with hood open and select “program ignition fobiks highline system”. Enter your PIN and follow the prompts. Once that is complete, and still connected to the hub, go to “RF Hub reset/replace”. This time, for PIN, enter 0000 and hit start. When the procedure is complete, step on the brake and start the truck. It will probably die after a few seconds, and you’ll have TPMS warnings. Now put the truck in run (engine off), still connected to RF Hub, click on the little engine then read and clear faults. Perform RF Hub replace again. Start the truck again and it should stay running now, but, you will have lost your TPMS sensors. Start driving around for a while to see if the sensors will pick up. If they don’t, pull over, connect to the RF Hub, go to “sensor rolls test”, hit start, and start driving again. They should immediately register now. Park the truck and clear faults again, and you’re done. Now you have push button start.”
On the above write up where it comes to entering 0000 for your PIN you would enter the original PIN that came with your truck. The 0000 PIN is for those of us who replaced our factory RF hubs.
Please note that there are several versions of AlfaOBD out there and the above information is for the 2020-ish version. Newer versions may not need the above steps.