Hello! I also reserch this question and i finded answer! You need click checkbox "Shared with workspace", but this work is strange.
Read more: https://support.atlassian.com/trello/docs/creating-and-managing-butler-commands/
Section: Share Butler buttons
P.S. sorry for my english, i from is Russia :)
P.P.S. I will be glad if I could help you.
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