There is no code to enter. The Firestick is a different product from a different manufacturer. The Google Play Store does have an app for The Roku Channel, and I believe you can log into your Roku user account within the app (I don't use it on any non-Roku device so don't know for certain). But that won't make your Firestick (or any other non-Roku device) "linked" to your Roku user account.
Dan
Roku Community Streaming Expert
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