Do you have a Roku voice remote (with a microphone button and TV controls) or some other remote? To pair a voice remote you have to factory reset the TV which you should do anyway if it's a used TV. If it's not a voice remote, it doesn't have to be paired, but it has to be the correct remote.
How do I factory reset my Roku® streaming device? | Official Roku Support
How to set up your Roku® voice remote | Official Roku Support
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