How to send messages to a broker via mqtt

That's great you can see the data, now can you do as @colin asked and show it to us?
It would be helpfup if you posted an export of your flow since no one but you can see it.

In order to make code more readable and importable it is important to surround your code with three backticks
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like this
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See this post for more details - How to share code or flow json