On the Eleven Sports app for Smart TV, Android TV and Apple TV:
Click on "Log In" from the app menu.
A 6-character code will appear on the screen.
From your device display or browser go to Elevensports.com. Log in if necessary. Enter the code that appears on the screen and select "Link".
After that, your device will be linked to your profile.
Note: the code expires after 10 minutes. If you have not been able to connect it in this interval, you will need to generate a new one.