Niagara wont follow keyframes a blueprint actor

hi there,

I am trying to animate a blueprint actor that contains a Niagara system that is spawning skeletal mesh actors of crowds. The particles spawn correctly on the blueprint actor but when I keyframe some gentle bobbing animation using sequencer on the blueprint the Niagara particles do not follow the motion.

I have tried a baked animation of the bobbing motion and using Skeletal Mesh Location in the Niagara nodes but have the same result.

Am I approaching this incorrectly?

Thank you.

Frederic