If your subscription is through Roku, the subscription is tied to your Roku account. Is your Roku TV linked to the same Roku account as your other Rokus, as identified by the email address used for each account? Settings > System > About on each Roku will show you.
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