It looks as if the board in question is not part of a Business Class team. The Observer feature is only available in Business Class. If you already have a Business Class team, you can associate your boards with the team using these steps: http://help.trello.com/article/752-changing-the-team-to-which-a-board-belongs
Hard to believe Trello has 100+ power-ups (known as apps for other Atlassian products) to choose from, enabling us collaborate with teams and organize our work and personal lives more efficientl...
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