Hi Axa,
Thanks for reaching out!
I'm afraid that is not possible at the moment. The user who clicks a card button or triggers a Butler rule will need to be a member of the board that is affected by the command.
This logic works the same way as if the user were to add or edit a card on the board; they need to be a member of the board they're making changes on.
Please let us know if you have any other questions, and we'll be happy to help.
All the best,
Lara
The Trello Team
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