IK Control issue, Rig, Bug?

So, i want to make parts to follow target,

So, the issue seems the ikc not working, even if i made them as rig,

the base the only one is anchored and others aren’t.

No code included.


I am trying to follow this video and I made everything like the video showed but it’s not working for me

External Media

This might be bug or might i forget something to do?