Slope annotation not working

I've read all the previous posts on the subject, but still I can't get side slope annotation to work. I've created 3D feature lines, and used the "create 3D by slope to target" function to create my earthworks extents. What I'd like to do is show the slopes with tadpoles, but I can't get any annotation to work. I've created side slope annotation which should be looking for the feature "Limit of CutFill Slope":

My earthworks extent is defined as this feature:

Next, I'd like to have the annotation from my hinge feature:

I've applied the annotation group to the feature symbology:

When I try and annotate my model nothing appears for side slope annotation, at all. I've even tried it with just simple lines and it still doesn't work. Am I missing a crucial step somewhere?