Need help !! How to deal with the composite keys used in "left Key" and "Right Key" while augmenting two objects in the dataflow ?? As in screenshot attached , I used two fields(which exist in both the objects) as left key and right key , but when I augment it shows the below error :-

"The dataflow was completed, but the LookupSingleValue node didn't augment any columns. Either the node didn't find any matches, or a join key contains only null values." on the augmented node.

Any idea what could be the issue and how can we resolve it?? Sadly I couldn't find any documentation on this specifically!!