Montage Play node fires however the animation does not change at all

I do have assigned the correct anim blueprint generated class into the character’s blueprint. The Character Speed variable is updated using C++ code and the blendspace responsible for the idle/walk/run works fine so I believe it’s not my logic’s fault.

Edit: It seems like that I can’t get any anim montage to play at all. Even if I strip down all the blending my anim montage will fire but the animation will not change.

-Orfeas