Traefik Cross Namespace Issues

whoami-deploy.yaml

kind: Deployment
apiVersion: apps/v1
metadata:
  namespace: tools
  name: whoami
  labels:
    app: whoami
spec:
  replicas: 6
  selector:
    matchLabels:
      app: whoami
  template:
    metadata:
      labels:
        app: whoami
    spec:
      containers:
        - name: whoami
          image: containous/whoami
          ports:
            - name: web
              containerPort: 80

whoami-route.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: whoami-ext
#  namespace: tools
spec:
  externalName: whoami.tools.svc.cluster.local
  ports:
    - port: 80
---
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: whoami-route
  namespace: default
spec:
  entryPoints:
    - web
    - websecure
  routes:
#  - match: PathPrefix(`/whoami-app-api`)
  - match: Host(`kub.example.com`)
    kind: Rule
    services:
    - name: whoami-ext
      namespace: default
      port: 80
      sticky:
        cookie:
          httpOnly: true
          name: cookie
          secure: true
  tls:
    secretName: tls-cert-example-com

whoami-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: whoami
  namespace: tools
spec:
  ports:
    - protocol: TCP
      name: web
      port: 80
  selector:
    app: whoami