traefik always send traffic via tcp to middleware not over TLS

Question

We are trying to encrypt communication between traefik ingress and middleware (forwardauth) & ingress to backend server also. Forwardauth redirects traffic to authentication server which is running over https and used selfsinged certificate.

In the wireshark i can see that ingress is communicating with authentication server using TCP insted TLS, but the communication between ingress and backend server using tls. Please help how to enable tls communication between traefik ingress and middleware .

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  annotations:
    kubernetes.io/ingress.class: traefik
  name: traefik-tls-1
  namespace: sample-domain1-ns
spec:
  entryPoints: 
   - websecure
  routes:
  - kind: Rule
    match: PathPrefix(`/api`)
    middlewares:
    - name: test-auth-https
      namespace: sample-domain1-ns      
    - name: test-auth
      namespace: sample-domain1-ns
    services:
    - kind: Service
      name: sample-svc
      port: 8002
      scheme: "https"
      serversTransport: mytransport      
  tls:
     secretName: domain1-tls-cert
     options:
       name: mtlsoption-ecprt
       namespace: sample-domain1-ns



apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth-https
  namespace: sample-domain1-ns
spec:
  redirectScheme:
    scheme: https
    permanent: true




apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
  namespace: sample-domain1-ns
spec:
  forwardAuth:
    address:  https://s-lb.sample-ns.svc.cluster.local:8080/auth
    tls:
       insecureSkipVerify: true

communication between traefik ingress and middleware as well as backend server should be on TLS.