Make sure you have:
For detailed info on setting up and registering your Samsung Smart TV, check out Samsung set up.
Heads Up! Upgrade to the latest app version of DIRECTV STREAM (version 3.23 or higher), for Live TV to continue functioning.
After you register and connect your Samsung Smart TV to the internet, you can add DIRECTV STREAM. With your remote control:
Important: Accessing the DIRECTV STREAM app on this smart TV will also be limited to your home Wi-Fi network.