When I am on my main board and open up a card it doesn't have the "Custom Fields" Tab option on the right hand side like it does on all my other boards. We have a premium subscription and I am the admin for the group. Not sure why that option is not there.
It could be that specific board is in a different workspace (which is not a Premium workspace). You can easily rectify it by moving that board to your Premium workspace https://support.atlassian.com/trello/docs/moving-a-board-to-a-different-workspace/
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