I can't speak to OAN specifically, but in general when you subscribe to a premium channel through a third party like Roku, Apple Tv, Fire TV, etc. your subscription is only accessable via that third party.
In order to access through a variety of devices you must subscribe directly with that channel on its web page. Then you can install the channel's app version for each device and log into it.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Do not ask me support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.". Please only do this if it ACTUALLY solves your problem.
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
