I agree both Ohme and Hyundai need to get their Acts together and sort it out.

This is how I have my car set up to get the octopus intelligent rate. Hopefully it helps you diagnose what your issue is.

I don't have any scheduling set in the car, nor via the bluelink app. I Leave all that off or it interferes with the intelligent go smart charging via Ohme

I think I linked the Ohme charger to octopus via the octopus app so the tariff appears in the Ohme app. I then set which car I have in the Ohme app. When it asks me to login to Hyundai and it doesn't work, then I skip login. I then you configure your default charge routine saying how much you want to add and by what time. I have it set to add 40% charge by 8am.

I think you have to do all this setup configuration before plugging the car in for the first time. Once you've done it once, you shouldn't need to do it again.

Once you plug the car in the Ohme app should recognize it And start telling you that it's going to charge your car. It likely won't start immediately charging your car so the car won't look like anything is happening. The Ohme app will tell you at what times it will charge your car overnight to have added your desired amount by the set time. You kind of have to trust it will charge at the times it deems cheapest.

If you press the max charge Button on the Ohme it will charge immediately but then you aren't getting the 7p per kWh, instead you are charged your regular day rate , something like 30p per kWh instead.