Items are no toggled via Rest Api

I have installed the Samsung Tv binding and it works to controll through an item via PaperUI. But when I am trying to dimm for example the volume via the REST API shell it does not work. When I am requesting the new state to controll if something was set, it response with the new setted state, but on the device nothing happens, the volume ist not dimmed. Does anybody knows what the issue is and how to fix it? Thanks in advance.

If you can provide the logs when things don’t work, we can all better debug what’s going on.