I have a layer with some attributes and a table joined with it which has additional fields. I want to access the joined table fields in pop-up design in my Webmap but the joined table fields doesn't appear in "configure attributes" or "Attributes Expression" windows. The Arcade guide page says it would be possible using $feature["joinKey.fieldName"] format and I tried it but it didn't work and the parser says that it could not find the field.
The relation between layer and table is defined to be 1-to-many, could it be the cause? (I doubt because it says it could not find the field). Did anyone implement a joined relationship in pop-up window design scripts?