Is the message body coming from an eMail? I wonder if that's where the HTML is coming from.
Try inserting an interim step, "Convert HTML to Text" and see if that cleans it up.
Keep us posted.
Thanks for the quick reply.
The message body is coming from an email in HTML as you guessed. I can't convert to plain text as I need to keep the HTML for the formatting. The problem is that the Flow Bot is not interpreting the HTML correctly. When I post using the Flow Bot, I get the result below:-
However, when I use flow to post the message as myself, it works perfectly. See below:-
Thanks again for any advice you can give.