It may not be apparent to many users that the various channel owners create, submit to Roku, and maintain the specific Roku-compatible versions of their apps that run on the Roku operating system. They also specify the Roku models they wish to support and the geographical regions in which their channel apps may be offered. Roku just provides the platform on which the channel apps run.
If you want to have a specific channel that's not available for your Roku model and region, you need to convince the channel owner to create a Roku-compatible version of their app, specify where it is to be available, agree to Roku's conditions, and submit it to Roku.
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