Try Order Tag Value in the constraint.
so use Order Tag name and then also under that use Order Tag Value
So it would be:
Order Tag Name Equals Order Actions
Order Tag Value Equals Price Change
Its somewhat confusing and personally I feel it should be changed to match.
Order Tag Name = Order Tag Group
Order Tag Value = Order Tag Name
I think the constraints should read Order Tag Group and Order Tag Name so it matches the actual structure of them when you set them up. @emre what do you think?