If the app cannot find your Samsung TV or the buttons have no effect, check the following.
- The phone and the TV are on the same Wi-Fi network (watch out for « guest » networks or split 2.4 / 5 GHz bands).
- The TV is on and properly connected to the network (Wi-Fi or Ethernet cable).
- Run the scan a few times: the network can take a moment to respond.
- Enter the TV's IP address manually (on the TV: Settings → General → Network → Network status).
- Make sure you accepted the Allow popup on the TV. If you declined it, reset the device list in the TV's network settings, then reconnect.
- As a last resort, restart the TV and your internet router.