The security of your device is just as important to us as your account.
The term 'Jailbroken device' typically refers to an Apple device in which the operating system has been modified and certain restrictions have been removed. These actions can prevent updates from being downloaded properly and can further expose the device to viruses and malware from websites or any apps downloaded from unverified sources.
In order to help you keep your account safe and secure, the sync.app will not function on 'Jailbroken devices'.