Harbor Helm Kubernetes address registry internally

[hAislt]

Hello everyone,

I am having issues with my setup and would appreciate assistance.
I deployed harbor with helm on an AKS with Traefik as ingress and an Application Gateway.
There is a separate listener which listens to the domain reserved for harbor e.g. harbor-domain.com.

I can access my harbor instance and pull/push images by accessing the configured domain, this domain is within my cluster not resolvable and I work with a TLS cert defined in ingressroutes.

I tried to spawn pods within the cluster to use the registry but this does not work I get:
dial tcp: lookup harbor-domain.com on 168.63.129.16:53: no such host Warning Failed 13s kubelet Error: ErrImagePull

So this obviously is a DNS issue. I tried using private DNS and pointed it to the service IP of my harbor-registry.
But this does not work as I use externalurl configured to my non-resolvable domain?

How can internal adressing of the registry be achieved?

Helm setup:
expose.type = ingress
expose.tls.enabled = true
expose.tls.secretName = "harbor-tls"

version 1.16.0

Do I need to change the expose type?
Thanks in advance.