The full text of the message will be “ERROR The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.”
This alert is caused by intermittent difficulties maintaining a connection to our activation server if you are using an older version of HUE Intuition. It only affects users running macOS/Mac OS X 10.11 (El Capitan) or later.
What you need to do is to ignore the top half of the activation screen and complete the bottom instead, inputting your email address, license key and offline activation key. If you don’t have these details yet because the code has never been registered, there is a help page here with instructions.
If you’re running Mac OS X 10.11 or later (or macOS), please update to the latest version of HUE Intuition here to permanently solve the problem.