I recently subscribed for premium channels such as hbo starz on my roktv in my bedroom can I still Use those services on my Samsung tv in my living room which is a non roku but it it has the hbo and starz app
If you subscribed and paid through Roku then maybe not, but you should probably check via HBO and Starz. You could connect another Roku to the Samsung and then you'd have access or cancel your subscriptions through Roku and subscribe directly with the providers.
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