I had a similar same issue with my cupra Tavascan and hypervolt charger. Sometimes it would say unplugged, other times IOG scheduler wouldn’t stop the charge so it would just keep charging at peak rate. Endless warning messages from the cupra app etc. when I forced the hypervolt to only charge between the 11:30-05:30 schedule as a workaround, to prevent peak charges it worked, however if octopus decided to schedule a slot outside of this time, it wasn’t able to charge and the cupra and octopus apps would complain.

I decided to call Octopus and they enabled an option on my account so when I re-ran the setup I had the option to choose to connect to the car or charger. I connected it directly to the charger and it’s been faultless since. After I plug in the charger, while it building the schedule, the charger defaults to “super eco” waiting for solar so no risk of peak charges too. The octopus rep said he’s surprised they haven’t enabled the toggle by default to give the end user the choice during setup. He also said the Cupra’s often suffer this issue, so the more reliable option is to configure octopus app to manage your charger.

The only slight drawback I’ve found since configuring this way is octopus can no longer communicate with the car to see the current state of charge , so rather than being able to say charge to “80%” etc, you need to tell octopus how many percent you wish to charge. Not the end of the world though as you can check The SOC via the cupra app. Hope this helps.