As you can see in this video, I have added my TV to Samsung SmartThings and when I try to control it it says that it's not connected. However as you can see also I can can see the content of the TV on my phone and I can control the source.
I have tried deleting my TV and then having it back to smart things but that did not solve the problem. I have deleted the cache and the data of smart things and that did not work either. I have tried to connect the TV to my Wi-Fi instead of cable network but that also didn't work.
I think that there's a problem with smart things and I have been stuck with this problem for months now.
I have made sure that my TV is up-to-date and that application is closed up to date. I have tried everything in the books but nothing seems to work and this is actually frustrating.