Dawn of the Hunt: Scavenged Plating doesn´t work

Hello,

the Spirit Skill "Scavenged Plating" doesn´t work anymore.
I´ve got enough Spirit and it is activated (right click).

In the battle it won´t activate anymore - the icon on the display doesn´t appear and i get no benefits of it.

Does anyone have the same issues? Can someone help?

Thank you!