When you subscribe through a 3rd party service like Roku (or Sling, Amazon, YouTubeTV, etc.) your subscription is generally with that third party, not the premium channel you want to watch. There may be some exceptions, but this usually means you can only watch that channel via that third party, not on some other platform. On Roku this generally means you can only access your subscription through The Roku Channel, as the channel's own dedicated channel app may not recognize your subscription.
If you subscribe directly with the premium service on its website, you then will be able to view the channel on any platform it supports: website via web browser on computer or mobile device, dedicated app on mobile devices, or dedicated app on supported streaming devices.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
