Airplay

“Android and iOS mobile devices using the Spectrum TV app can send programs to watch on their TV using the Cast feature or Apple Airplay Mirroring.” [1]

How to AirPlay video and mirror your device's screen - Apple Support

You will need an Apple TV set-top box or AirPlay 2-enabled TV.

Airplay to what device, please be specific when describing the device. Also, have you verified Spectrum allows Airplaying their content??