I have service account name: myservice

$ kubectl get serviceaccount 
NAME        SECRETS   AGE
default     1         15d
myservice   1         15d


$ kubectl get serviceaccount myservice -o yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  creationTimestamp: 2018-06-13T12:41:18Z
  name: myservice
  namespace: default
  ...

I want to change the service's namespace default to development.
I tried to edit it with:
kubectl edit serviceaccount myservice

After saving it I received:

A copy of your changes has been stored to "/tmp/kubectl-edit-gjae6.yaml"
error: the namespace from the provided object "development" does not match the namespace "default". You must pass '--namespace=development' to perform this operation.

So I tried like they wrote and it still didn't work:

$ kubectl edit serviceaccount myservice --namespace=development
Error from server (NotFound): serviceaccounts "myservice" not found

The namespace development is exist and also the service myservice.