If your Niro doesn’t have Kia Connect, which I don’t believe all trims eapecially entry level have, so it wouldn’t work with oi. If your Niro is compatible you need to upgrade to the latest firmware and turn of scheduling controls from the charger and et the car up to schedule.
It does have Kia connect and managed to get it set up and working (mostly) in the end but it there were some issues when I first tried to set it up. Also sometimes it doesn’t want to connect for what ever reason and a few times it hasn’t charged over night etc.
Prob not all down to connect through the car but octopus recon its better through the charger. At least ill have both options soon.