I have no idea why today I am getting this error advising a subscription is required to watch tv on my phone. This app always worked up until a day or two ago and my subscription is just fine.
Well...you were lucky for a while. The app has finally recognized that you aren't on your home network where your subscription to cable tv is active.
You can use your Spectrum log in info to get access to most networks' individual apps while outside of your home network.