When I shared Trello with my community on Discord, I've got many feedbacks about Trello asking them to login first to see the board, how can I fix it? I once opened a Trello board from another server and it didn't want me to log in to see it.
You can click on the lock icon on the board to change visibility of the board, and make it public:
https://support.atlassian.com/trello/docs/changing-the-visibility-of-a-board/
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