I am new to Arcade. I've read everything I can find, but still can't quite get the AreaGeodetic function to work on this one. I am trying to measure the area in acres of the polygons on an ArcGIS online map, and add that to the pop up.
Here is what I'm working with:

When I use the AreaGeodetic Function as ($feature, 'acre'), it returns a result of 0. I'm certain I'm missing something silly. I tried it in other maps and it works.
This is what the Configure pop ups looks like for the polygons:

Thank you.