Feet IK solver with FABRIK issue.

I tried to follow directions of this tutorial here IK / FABRIK blueprint tutorial for proper foot placement with capsule collision - Animation - Unreal Engine Forums

my only issue i couldn’t follow is to create two feet target bones parented to the root. Is it even possible to add bones to the unreal manequin? But basically my issue is that the model is doing what it’s supposed to except the feet ik are not interacting with the environement. Any ideas?