I’ve had a ‘new’ phone for a few years now and never activated the sim for it, but when I try now in the: Change SIM Card setting it says “Invalid SIM number; please check the 19-digit number entered”. If I try in the Let's get started with activating your Koodo Prepaid account! it says “SIM card number is not available to be activated”
It’s the right code, I have no reason to think it’s not a prepaid sim…