As David has mentioned this is a premium feature, also check out other options we reviewed here https://www.bluecatreports.com/trello-reporting/exporting-trello-data/
Hello @Natasha Davidson
From the Exporting data from Trello page:
If you need spreadsheet support, boards exported with Premium include CSV exports which can be imported into spreadsheet applications like Excel. Each user in a Premium Workspace (not including guests) has the ability to export the board as a CSV
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