Unsupported service type "ExternalName"

I’m trying to connect 2 AWS EKS clusters. I followed the steps in Istio / Install Primary-Remote. Then I validated the installation.
When trying to create a deployment in the remote cluster it fails when trying to create a sidecar container in the pod with the following error.

Failed calling webhook, failing closed namespace.sidecar-injector.istio.io: failed calling webhook “namespace.sidecar-injector.istio.io”: failed to call webhook: Post “https://istiod.istio-system.svc:443/inject/cluster/cluster2/net/network1?timeout=10s”: unsupported service type “ExternalName”

I don’t understand why it says: unsupported service type “ExternalName”. I use K8s 1.25.