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Welcome to the forum Matthew, you didn't save it as a tbwx, so there's no data in your file.There should be a way we can help.
Thanks Alex! I've added the .twbx file.
One option is to create a calculated field similar to the following:
if isnull(sum([Total Area Certified]))=true then 'white' else 'green' end
Then, toggle to the Marks Card that uses the shape mark. Place the calculation on the color shelf and edit the color legend to make the white marks white.
Hope this helps!