Currently, both MyCircle and Circle Go require a Circle with Disney device installed on your home Wi-Fi to work. If you download MyCircle from the App Store and launch it from your iOS device without it connected with Circle, this is what you will see:
If you are receiving this alert and have a Circle with Disney device installed on your network, check to make sure that you can access MyCircle:
Confirm that your Circle with Disney device is powered on and setup on your network.
Assign your iOS device to a filter level other than None. Any device that is set to a filter level of None or is an "Unmanaged Device" will not be able to use MyCircle or Circle Go.
Ensure that your iOS device is connected to your home Wi-Fi the first time you attempt to launch MyCircle. Until it makes that initial connection over your home Wi-Fi, it will not be able to load properly.