Basic Rewrite target fails as namespace is appended to middleware name

Traefik Traefik v2 (latest)
,
5

@jakubhajek
I found this link here which seems to make sense, however even after adding the annotation it still doesn't work for me. Note the new annotation in the IngressRoute ....perhaps it only works for Ingress resource?
How to configure middleware with kubernetes-ingress? (middleware "xyz" does not exist)
Here's my config.

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  annotations:
    traefik.ingress.kubernetes.io/router.middlewares: b2b-video-service.b2b-watch@kubernetescrd
    kubernetes.io/ingress.class: traefik
  name: watch-service
spec:
  entryPoints: []
  routes:
  - kind: Rule
    match: Host(`video-service.b2b`) && PathPrefix(`/watch`)
    middlewares:
    - name: video-service.b2b-watch
      namespace: b2b
    priority: 0
    services:
    - kind: Service
      name: video-service
      namespace:  b2b
      port: 8080
---
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: video-service.b2b-watch
  namespace: b2b
spec:
  replacePathRegex:
    regex: ^/watch(.*)
    replacement: $1