Rules not being applied when calling an external service

Hello everyone, :wave:

I’m using Istio 1.2.3 (EKS) and I am working on a custom attribute generating adapter that works well with Rules that match ingress traffic. However, they are not applied on egress traffic at all. I am not quite sure why the Mixer’s check call doesn’t occur when a service inside the mesh is calling an external service. Is there something I am missing?

I apologise in advance if this is a basic question covered by the documentation. Thank you for your time reading this!

Just curious whether anyone else experienced this.