Read Custom Animation Curve from animation Playable Graphs?

When I play an animation the standard way from within the AnimationController, custom animation curves on the animation update the parameters correctly. I can then read those parameters values and feed that information to the relevant places at run time.

However, when I play the same animation via playableGraphs, the parameters aren't updating.

I ideally need a way to expose/read the custom anim curve information, from the animation playable graph clip(s) that are playing.

If anybody has any ideas why I would be extremely grateful!

Thanks

Craig