(Pt 2) "Cadillac Expert"...has NO CLUE!! ('17 CTS: Key Fob Programming FIASCO)

After Diagnosing and Repairing the extremely Intermittent Network Fault in Part 1, the customer also requested to program an extra KEY FOB on his 2017 Cadillac CTS. He provided a USED fob that he bought on eBay. But apparently only NEW VIRGIN key fobs can be programmed to the vehicle... Sometimes we learn the hard way. Enjoy! Ivan