Samsung TV Remote app - not working with my new television

Since my Samsung TV was broken (far too soon) I had to buy a new one. It is a QE55Q70RALXXN.
Before the Samsung TV Remote pluging always worked well in delivering an “off” signal via the IP network to the TV (WLAN or Cable did not matter). I never used any other commands. But since the new TV I tried to match the app on the new IP adress but nothing seems to work. Any thoughts on why this might be and any tips to cotrol my TV (turn off and maybe on) via the IP interface using Vera?