“RightHandSocket” is not able to have a parent socket although being a child of the mesh
I get this error in the output log
LogSlate: Warning: Menu could not be pushed. A path to the parent widget(SSubobjectBlueprintEditor [BlueprintEditor.cpp(2950)]) could not be found
I had the same issue, but found a work around…I attached it in the blueprint intead. It does be off a bit but you can adjust it to fit correctly.
However some time ago I did manage to get it to work wheer I could change the parent socket from the details, tho I believe that was UE 5.2, I had upgraded it to 5.3 since.