Had exactly the same problem a while ago. It was the battery. Changing the battery from my functioning key to the dead one didn't fix the problem. I thought it was a faulty keyfob so went to the dealer. They put in a new battery and all was good again. Skoda dealer had no idea why a battery worked fine in one fob but not the other.
2 days ago · Skoda Octavia; Find Car Dealers; Other key design details observed include the coupe-like roofline and sleek LED taillights. While the smaller 52 kWh and 58 kWh battery packs are paired to
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