People on this forum should really be more attentive to others. I haven't gotten a warm welcome either. I just saw your post, but I also just signed up for my first time 24 hours ago. Your smart TV is considerably newer than mine, so it shouldn't be an out of date thing. When you say it's not working, in what way is it not working? Network not responding/App not connecting? Has the app been removed? A lot of my apps have been auto removed due to being out of date. I would try uninstalling it, and then re-installing to see if that works.
Hopefully that's a helpful start. I noticed no one responded to your post, and rather than leaving you hanging the way everyone has left me, I figured I would at least give you a response. Let me know if you are needing any further troubleshooting assistance.