Having done some searching it appears the issue is not with Sofabaton its with Sony. Sony don’t allow unofficial equipment to turn the PS4/5 on. Harmony users are in the same boat (que Harmony user to tell me I’m wrong, and I could well be as I’ve never owned a Harmony or a PS4/5). But it appears you need to use the PS4/5 controller, buy the Sony Playstation Media Remote or use CEC from your TV to turn it on. There was a Bluetooth adaptor for the Harmony at one point but that is no longer available.