If you and your friends are connected to the game through Facebook but still can’t see each other, then it’s most likely due to your settings on Facebook.
Here’s an easy fix:
Go to your Facebook account through the official website or application.
Go to your “Settings”.
Click on “Apps and Websites”.
Check the “Backgammon Lord Of The Board” box.
Click “View and Edit”.
Make sure that “Friends List” is enabled!