Step1.
Please copy folder of "Reallusion" to C:\Users\Public\Documents\My DAZ 3D Library\data\DAZ 3D\Genesis 3\Female\Morphs
Because we need this morph data in DAZ when we convert facial key.

Step2.
To open DAZ, drag "Genesis3_Female_iCloneFaceKey.duf" to the character that you want to export. 
It will create facekey in DAZ, and then you can export FBX to 3DX.