Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Do as @Strega says and confirm you are logged in to the same Roku account on your Web browser (https://my.roku.com/) where you set the PIN, and on the Roku box Settings > System > About
If they are the same, re-enter the PIN from your Web browser and ensure you are not making a typing error. You may want to use the numbers at the top of your keyboard and not any keypad on the side, just in case keylock is accidentally off.
Once you've confirmed the PIN in your Web browser, reboot your Roku device and try again.
DBDukes https://www.dbdukes.com/Roku Ultra (4660) Roku Streambar (9102) Roku Streaming Stick+ (3810)