[5-0] Control Rig: Unable to correctly set a baisc IK without the mesh to get messed up

Development Character & Animation
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1

I’m trying to get a basic foot IK of my character.
The mesh is from this package: POLYGON - Sci-Fi Space Pack
The animations work fine, but not the the Control Rig.
Here is the leg without IK:

2022-03-06 09_05_08-HexWorld3GOTY - Unreal Editor
2022-03-06 09_05_08-HexWorld3GOTY - Unreal Editor533×606 293 KB

Here is the leg with IK:
2022-03-06 09_05_21-HexWorld3GOTY - Unreal Editor
2022-03-06 09_05_21-HexWorld3GOTY - Unreal Editor558×607 308 KB

And here is my control rig set-up:
2022-03-06 09_06_51-HexWorld3GOTY - Unreal Editor
2022-03-06 09_06_51-HexWorld3GOTY - Unreal Editor811×651 117 KB

I’ve watched a lot of tutorials from Andreas Suika, and I can’t seems to make it work properly.
I’ve tried different settings from the primary and secondary axis, but it doesn’t seems to work.

Any idea how to get it right?

2

I believe my problem is related to this topic: Is there a way to change the axis of rotation of a bone in your armature?

The bone axis orientation seems to be problematic.