Horadrim recipe does not work

I got a white monarch, a TAL, an AMN and a perfect ruby but i cant use the cube for the socket-recipe → any suggestions?

http s://abload.de/image.php?img=monarch6ykkb.jpg

-diana-

Das Rezept funktioniert nur mit normalen Bases. Also kein “Guter Monarch”. Sondern nur “Monarch”.

Cube recipe only works on base items. Does not work on superior.

also will not work if your cube is in the stash.
You have to put your cube into the inventory.

Thank you guys - just thought a normal white shield should work.

-diana-