way late to the game on this one, but I came across this post hoping for an answer when I had the same problem. YMMV, but my "Item has already been added. Key in Dictionary" issue stemmed from emailing attachments from multiple process flows. I simply deleted all my shortcuts from my process flow that handled the email function, then rebuilt the "send as a step in the project" adding the other shortcuts.reran the project and voila, no more errors. hope this helps someone, good luck!
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