Growing up around the faith, Whenever I heard something taught, I'd always think there is a different way of looking at that, probably better.
We always hear "This Good News of the Kingdom will be preached... " Matt 24:14.
So I think, is there more to it than preaching the kingdom?
Luke 17:21 the KJV and ASV says "Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you", (which is where they get the wrong belief that the kingdom is in their hearts) but many other bibles including the NWT say "nor will they say, ‘Look, here it is!’ or ‘There!’ for behold, the kingdom of God is in the midst of you"
What was in the midst of them was Jesus. So the Kingdom of God was also another way of saying it's king, Jesus.
So, in Matt 24:14 "This good news of the Kingdom" could also mean the king of that kingdom. Jesus would be preached in all the inhabited earth.
Which is what Act 1:8 in the NLT says "And you will be my witnesses, telling people about me everywhere—in Jerusalem, throughout Judea, in Samaria, and to the ends of the earth.”"
The Witnesses are preaching about the Kingdom when they should be preaching about the King.
But if you write to the GB and tell them that, you will be brought before a committee. Sad.