AnimMontage doesn't play sequence

I have made some custom animations by modifiying the animations in the AnimStarterPack. Creating AnimMontages from these work fine and the sequence plays in the montage. Recently i switched to the third person standard animations and skeleton and created a sequence from the idle animation. The problem is that when i make a montage from that particular sequence the animation does not play, in the montage viewport nor ingame.
Creating a montage from every other animation in the project works fine.
Worth noting that the sequence previews as expected in the montage(to the right in the pic).

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