Have you ever opened that board before on the iPad app? If not, that board hasn't been synced yet, so there's no way to open it for the very first time while offline, unfortunately.
Because of the amount of data that might be on certain boards, Trello doesn't pre-load absolutely every board, only ones that you open while online. Those get synced for offline use.
I'll be sure to let the team know you'd like to see some improvements there in the future!
If you had to thrive a new habit during a lockdown, what would it be? Trello
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