Hi HannahKirk,
I'm using Windows & was able to get that field to go into the other areas.
What I did was as per the below steps;
Copy the data & Paste Special into a new workbook & worksheet
Create the pivot from there.
I found your formatting & other settings were stopping me from getting it to work.
If there's a reason to have that formatting, try to add it after you've created the Pivot.
Hth
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