ChazBolon

I am unable to get my 2018 suburban premier to enter programming mode for they keyfob. I have followed all the tutorials online for programming a new fob with no luck. I only have 1 working keyfob so I have been using those sets of directions. I insert the emergency key into the tumbler, I turn it counter clockwise 5 times and nothing happens. I have tried it with the fob in my hand, I have tried locking the doors first, I have tried it with the door open and closed. I have tried starting the car, turning it off, and then doing it. I have tried it with the car on. I have tried it with the keyfob outside the range of the car with just the emergency key. basically I have tried every variable I can think of that would be causing it to not enter programming mode. I am hoping someone has a bright idea for me.