const eventingControllerSAName = "system:serviceaccount:knative-eventing:eventing-controller"

apiVersion: sources.knative.dev/v1
kind: PingSource
metadata:
  name: test-ping-source
  namespace: knative-random

spec:
  schedule: "*/1 * * * *"
  contentType: "application/json"
  data: '{"message": "Hello world!"}'
  sink:
    ref:
      apiVersion: messaging.knative.dev/v1
      kind: InMemoryChannel
      name: foo
---
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: event-display
  namespace: knative-random
spec:
  template:
    spec:
      containers:
        - image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display:latest
---
apiVersion: messaging.knative.dev/v1
kind: InMemoryChannel
metadata:
  name: foo
  namespace: knative-random

---
apiVersion: messaging.knative.dev/v1
kind: Subscription
metadata:
  name: my-subscription
  namespace: knative-random
spec:
  channel:
    apiVersion: messaging.knative.dev/v1
    kind: InMemoryChannel
    name: foo
  subscriber:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: event-display

admission webhook \"validation.inmemorychannel.eventing.knative.dev\" denied the request: validation failed: Channel.Spec.Subscribers changed by user system:serviceaccount:knative-system:eventing-controller which was not the system:serviceaccount:knative-eventing:eventing-controller service account

 **Knative release version**
1.16

 **Additional context**
Add any other context about the problem here such as proposed priority