Microk8s中Cert-Manager应用Issuer报错：找不到指定webhook服务

执行命令：

kubectl apply -f issuer-lets-encrypt-staging.yaml

返回报错：

Error from server (InternalError): error when creating "issuer-lets-encrypt-staging.yaml": 
Internal error occurred: failed calling webhook "webhook.cert-manager.io": 
failed to call webhook: 
Post "https://certmgr-cert-manager-webhook.cert-manager.svc:443/mutate?timeout=10s": 
service "certmgr-cert-manager-webhook" not found

我的Issuer配置文件内容：

# issuer-lets-encrypt-staging.yaml
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: letsencrypt-staging
spec:
  acme:
    server: https://acme-staging-v02.api.letsencrypt.org/directory
    email: <email-address> # ❗ Replace this with your email address
    privateKeySecretRef:
      name: letsencrypt-staging
    solvers:
    - http01:
        ingress:
          name: web-ingress

cert-manager命名空间下的所有资源状态：

kubectl -n cert-manager get all                  
NAME                                           READY   STATUS    RESTARTS   AGE
pod/cert-manager-cainjector-64d74f9c8f-szj8d   1/1     Running   0          20m
pod/cert-manager-b4b465456-lnjtw               1/1     Running   0          20m
pod/cert-manager-webhook-66fff58cdf-dtdcv      1/1     Running   0          20m

NAME                           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
service/cert-manager           ClusterIP   10.152.183.213   <none>        9402/TCP   20m
service/cert-manager-webhook   ClusterIP   10.152.183.44    <none>        443/TCP    20m

NAME                                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/cert-manager-cainjector   1/1     1            1           20m
deployment.apps/cert-manager              1/1     1            1           20m
deployment.apps/cert-manager-webhook      1/1     1            1           20m

NAME                                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/cert-manager-cainjector-64d74f9c8f   1         1         1       20m
replicaset.apps/cert-manager-b4b465456               1         1         1       20m
replicaset.apps/cert-manager-webhook-66fff58cdf      1         1         1       20m

这个问题已经困扰我一个月，求各位帮忙解决。

内容的提问来源于stack exchange，提问作者ayalcin