Why does my animation does not play, when combined into an Animation BP?

Hello everyone,

I am using unreal engine version: [4-24-3]
I am having a weird problem. I have composed an animation sequence, using a pose asset and an interpolation between two curves. this animation plays well within its own editor. However, when combined with an animation blue print, it does not play at all. not in the preview window, and not on the placed Pawn.

Here’s a video that demonstrates it: UE4Editor_IMQ3RTJVsV on Vimeo

Anyone has any idea why its not playing?