Failed to call service media_player/turn_off. {'event': 'ms.channel.unauthorized'}
I got this as well when pressing the on/off.
Samsung Tv Nu8000 (2018)
media_player:
- platform: samsungtv
host: xxx.xxx.xxx.xxx
port: 8001
name: Samsung TV
timeout: 30
mac: 64:1c:ae:11:14:d5