Cant move first bone in IK chain

Hello, I have a first person arms rig that I want to move the shoulders of to simulate the upper body rotating in first person.

I have set up an ik chain for each arm individually and everything else works perfectly. However, when I try to move the shoulder bone it just does nothing, the move tool just stays in place when I drag it. It also doesnt work if IK blend is set to 0, so I dont know if IK has anything to do with that. Do you know why this could be happening?

Thank you!

setup.png