After missing the 2018 deadline the Charter Spectrum app is finally available on Apple TV with zero sign-on support.
Charter Spectrum App
The Charter Spectrum app lets customers watch any channel or on-demand content on Apple TV with their bundle. Zero-sign on will automatically authenticate your subscription but only if you also have a Spectrum internet plan.
Zero sign-on is a feature Apple added that replaced single sign-on. With single sign-on you only had to enter your cable TV account to Apple TV once. With zero-sign on you don’t have to enter anything. Instead if you’re connected to your provider’s Wi-Fi your information will be automatically entered. But it’s not widely available.