@slime
Morning mate!! Sounds like a fault to me!! Your RS has various antennas around the car for picking up the key signal, this is how the car knows where the key is, e.g. drivers side, pass side, tailgate or inside. If your Keyless Entry is working from the passenger side but not the drivers then it may well be an issue with the driver side antenna.
Does the tailgate open using the Keyless Entry?? If so, it sounds like the antenna at the drivers side isn’t picking up the key signal.
Cheers, Marc.
MY/17, F/White, Forged Black Wheels, Recaro Shell Seats, Diamas SiRamik Glasscoat, H&R Anti-Roll Bars/15mm Spacers, EBC Turbo Brake Discs all round/Yellowstuff Brake Pads, Mountune Air Intake/Recirc Valve/SSC/Blue Turbo Hose Kit and Hard Pipe/Uprated Springs/Short Shifter/Rear Motor Mount/Crank Breather Plate, ETS Intercooler, Milltek 100 Cell Cat, Remus Wolf Inside Exhaust, Litchfield Stage 2 map via Cobb Accessport V3, DSC unit.