I also wanted to add that it could have been a timing issue? I had contacted Rachio support about this issue and they informed me there was an issue and they are working on it, so I stopped trying and went to working on my Garage door opener. There was about an hour window between when I stopped attempting to connect the Rachio controller and then saw the controller available to add through HomeKit. It could have been there immediately in HomeKit App but I did not look there until an hour later.
