@Jamie Suid Welcome to the Atlassian community
it depends on what version you are using. Here are some helpful articles.
Thank you! In my case this person is actually a guest, but I don't see anything obvious to remove them.
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@Jamie Suid What plan are you on? It looks like the workspace guest created the board hence the reason they are the board admin.
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Free plan. Yes they created the board under my Workspace account.
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@Jamie Suid You will have to either have them change it and make you admin or follow the steps here: https://support.atlassian.com/trello/docs/changing-the-admins-of-a-workspace-or-board/
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