AnimMontages don't play when in Sub Anim Instance

I have an AnimBlueprint that had working AninMontage playing blueprint.

However, when I turn this anim BP into a sub anim instance the slot doesn’t play.

Also as a side note, the parent BP that contains the subgraph throws a compilation warning about duplicate slot names used if my child anim BP has 2 slot nodes for the same slot node. The normal anim BP compiles this without problems.

Hello,

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Thanks