The first service providers to supprt Single Sign-On include:
- CenturyLink Prism
- DirecTV
- Dish
- GVTC
- GTA
- Hawaiian Telcom
- Hotwire
- MetroCast
- Sling
To enable Single Sign-On on tvOS all you have to do is make sure that you have tvOS 10 or later, then go to Settings > Accounts > TV Provider > Choose your TV provider and sign in with your TV-provider account information, while on iOS you need to make sure that you have iOS 10 or later, then go to Settings > TV Provider and choose your TV provider, and Sign in with your TV-provider account information.