In a free account,
A member can create a private board assigned to the team. He can manage the board like he wants. In this case, the admin himself cant see the board If he is not invited.
But your case is different.
Last resort : create a new team, transfer members and boards, close the old team.
I cannot enter the board. It appears within my team boards, but I cannot enter it. I am the admin of the team. I don't know who created it. I do not reckon some team member created it. When browsing my team members list, this "Private board" does not appear at any of the members. I do not reckognize the board at all. There is a question mark icon on top of it saying something like "You need to extend to Business Class for team admin to access private boards...".
If you had to thrive a new habit during a lockdown, what would it be? Trello
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