I have the same year model but petrol auto.
After replacing the (dual circuit) brake pedal switch and side brake light globes around September last year to fix the ESP light on the dash (ESP light also prevented the cruise control working), and then Hyundai performing multiple recalls on the car later last year (we bought the car about a year earlier, so not the original owner), we have been unable to set cruise control. I read on another forum, that one of the recalls relates to reprogramming the ECU and may have affected the cruise control. They were no ECU codes on my code reader after I replaced the brake pedal switch and brake globes to fix the ESP light. I’ve booked it into Hyundai to fault find, but I’m not keen to pay their $200+ code-read fee when there are no codes and I suspect it’s caused by their fix as part of the recall.