Exporting Ik Bones From Blender to unity

Hello Every One:
Its my first post at this forum i really stuck with this issue and couldn’t find the solution any where else on the internet, I just created my first character model and then rigged the model with FK and Ik bones. The armature behave works pretty well in blender but when i export the model into unity all the FK bones work very Well but IK bones doesn’t respond to and\y movement…
I don’t have any idea If there is any thing wrong with my Model,rigging Or Exporting?
Thnx In advance.

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