@douglaster Yes, I have the same "invalid argument" when trying to use a preset turn on with my dimmer switch. I have several outlet plugs, and switches and the only one that offers a sunrise/sunset...

@Carl I also have a HS220 Version 1.0 with Firmware 1.5.10 and I do not see the offset option in the app. Is there a reason some people get it and others don't?