Middleware not found in IngressClass

Traefik Traefik v2
, ,
1

Here is the yaml file for traefik ingress and middleware. I want to add a basic auth middleware to a service, but once I added this annotation traefik.ingress.kubernetes.io/router.middlewares: default-testauth@kubernetescrd, it will show a "middleware not found" error in dashboard. I think this is the correct way to use middlewares in traefik ingress, but why does this error come up always?

I also can see this middleware under Custome Resources section of Lens as it shows below.

image
image2118×1522 163 KB 

traefik version 2.9.4

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: testauth
  namespace: default
spec:
  basicAuth:
    secret: basicauth
    removeHeader: true

---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: k3s-test
  namespace: default
  annotations:
    traefik.ingress.kubernetes.io/service.passhostheader: "true"
    traefik.ingress.kubernetes.io/router.entrypoints: web
    traefik.ingress.kubernetes.io/router.middlewares: default-testauth@kubernetescrd
spec:
  ingressClassName: traefik
  rules:
    - host: dash.local
      http:
          paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: k3s-demo
                port:
                  number: 80

image