Arcade Area expression trouble

[LexiPassaro]

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.

[MarkBockenhauer]

Adding an expression like this one should work.

return round(areaGeodetic($feature, 'acres'),2)+' '+ 'acres'

[LexiPassaro]

Thank you, however it still returns 0. Here is a screen shot of the test:

[MarkBockenhauer]

Try it with a polygon feature in your map, that you know has an area.   The  %feature test result is for the feature with OBJECTID 1 (or lowest), is there a chance your OBJECTID 1 polygon feature is not a good one?

[LexiPassaro]

Hello - Thank you. That must be it. It does work with other polygon features, but not this one. Is there a way to fix that?  I'm happy to read/watch a tutorial if you know of one.

It's only four polygons, so I guess it's an option to manually "trace" what's there using sketch layer...