I am trying to view related data in the attribute table widget in Web AppBuilder. It is a one-to-many relationship and everything works fine on the ArcGIS Online webmap. When I try the same thing in Web AppBuilder, the Attribute table widget comes back with "No related records found" but I know that there are records. The related records are stored in a table that is hosted on ArcGIS Online.
When I open the browser dev tools I see this error:
Error: Invalid URL
I do not have the table showing in the attribute table by default. I am not sure if this is causing the issue.