ArcGIS Pro Report Expression Not Reading Joined Field Correctly

[dnieves]

Hello, I am creating a report in ArcGIS Pro and using an Arcade expression to group two field values into a single label. The field I am referencing comes from a spatial join. 

I have also tried other alternatives such as using what if statements.

The expression returns nothing. So how should joined fields be referenced inside report expressions? Do joined fields need a specific syntax in Arcade when used in a report?

Thank you!