Who I have the same questioned this topic

I'm in the NBC app trying to watch a show. When I click on the episode I get the error message "Sorry under your current setting you can only playback video on WiFi. If you'd like to connect via cellular data networks for playback, change your preference under setting in the app." I went in settings and then to the bottom to the nbc app and it's set to use cellular data so I'm not sure what else to change?