Thanks for responding. You only link your Roku to your user account when the player is first purchased and set up. It should never require linking again unless you've done a factory reset, which does make it act as a brand new device again. The 3700 is an older device, but still officially supported by Roku. I have never recommended the basic Express, as it has less than stellar WiFi performance, and a better device just isn't that much more money.
Go into the Settings/System/About menu and see if the email address listed matches your Roku user account. If it does, then there's no need to link your player.
Roku devices no longer use a code to link a new device to your account. Instead it asks you to enter your Roku account email address and you receive an email with an activation link. This was done because of scammers tricking users to go to their bogus registration site and steal your credentials.
Is it you're trying to log into a specific app/channel and that is what's asking for a code? That would make more sense, but since I don't use that channel I'm uncertain how you log in/subscribe to their channel.
Dan
Roku Community Streaming Expert
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