How to trigger custom facial emotions?

Unreal Engine Questions
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4

I found this post: How to use character initial emotions

Here they perform the happy animation by pressing the key “X”

I think this is under Convai Base Character, Event Graph.

I did it there, it did not work.

I tried triggering the emotion on the Metahuman’s Blueprint on Event Begin Play. The animation play for 1 second and quickly goes back to Neutral.

Where can I lock emotions?