We just tried our test unit and it's working fine for that command. Nothing changed relative to this. — A member replied: “the TV is at the latest firmware (though I'll double check). Separately, everything else seems to work fine - I can control the rest of the TV and it powers on and works fine otherwise.”
We just tried our test unit and it's working fine for that command. Nothing changed relative to this. Perhaps it was a network issue? Try resetting everything in the chain and testing other commands. Also, check for the latest firmware for the TV.