How to enable teams notification ?

[timam]

I have a helm chart, and I deploy that chart into EKS with ArgoCD. Now my goal is to get notification on Teams channel after sync.
As described on https://argocd-notifications.readthedocs.io/en/stable/ ; I have installed Argo CD Notifications and riggers and Templates from the catalog.
Since my plan is to make teams notification workable, I jumped to https://argocd-notifications.readthedocs.io/en/stable/services/teams/
and followed step 1 to 6. Then comes the following part which confuses me.

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  annotations:
    notifications.argoproj.io/subscribe.on-sync-succeeded.teams: TestChan

If I try to run kubectl apply it gives me validation warning, after skipping warning, it gives me following error

error: error when retrieving current configuration of:
Resource: "argoproj.io/v1alpha1, Resource=applications", GroupVersionKind: "argoproj.io/v1alpha1, Kind=Application"
Name: "", Namespace: "argocd"
from server for: "teams.yaml": resource name may not be empty