I'm watching a TV series on Roku, on my TV. No issues. Access to everything. I try watching on my Samsung s10, and the Roku app says this content isn't available without premium subscription. Yet....I can finish watching an episode on my phone if I've started watching on TV. But the next episode won't prompt on my phone. What's up with that?
You didn't state the app you were using on Roku (there are thousands, after all, so that's important). Based on your saying you are using the Roku app on your Samsung phone, that indicates you were using Roku Channel on a Roku device to watch.
Is it content from a premium subscription (which can be purchased via Roku Channel, plus via other means)? Which one?
If you provided more information, to include the actual content you're trying to watch, that may be helpful. If we have enough information, we can attempt to replicate the problem. Once that's done, we can figure out how to fix it.
Roku Community Streaming Expert
Note: I am not a Roku employee.
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