Samsung Smart TV - No control?

I get “ms.channel.unauthorized” when connecting to Samsung TV UE55NU6035 and I haven’t been able to figure it out.

Here are the logs when pressing the on/off button in the UI:

2019-03-07 16:38:59 ERROR (MainThread) [homeassistant.components.websocket_api.http.connection.4552020656] {'event': 'ms.channel.unauthorized'}
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/homeassistant/components/websocket_api/commands.py", line 148, in handle_call_service
    connection.context(msg))
  File "/usr/local/lib/python3.7/site-packages/homeassistant/core.py", line 1133, in async_call
    self._execute_service(handler, service_call))
  File "/usr/local/lib/python3.7/site-packages/homeassistant/core.py", line 1155, in _execute_service
    await handler.func(service_call)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/entity_component.py", line 188, in handle_service
    self._platforms.values(), func, call, service_name
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/service.py", line 278, in entity_service_call
    future.result()  # pop exception if have
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/service.py", line 292, in _handle_service_platform_call
    await getattr(entity, func)(**data)
  File "/usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/components/media_player/samsungtv.py", line 214, in turn_off
    self.get_remote().close()
  File "/usr/local/lib/python3.7/site-packages/homeassistant/components/media_player/samsungtv.py", line 138, in get_remote
    self._remote = self._remote_class(self._config)
  File "/Users/henrik/.homeassistant/deps/lib/python/site-packages/samsungctl/remote.py", line 11, in __init__
    self.remote = RemoteWebsocket(config)
  File "/Users/henrik/.homeassistant/deps/lib/python/site-packages/samsungctl/remote_websocket.py", line 30, in __init__
    self._read_response()
  File "/Users/he