How to yield an AnimationPlayer controlled by AnimationTreePlayer?

:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Gokudomatic2
:warning: Old Version Published before Godot 3 was released.

How do I yield an animation which is controlled by an animation tree? If I simply try to yield the animation player with the finished signal, it never happens.