argoCD not able to sync even after detecting changes

I’m trying to setup an argoCD application, with following syncPolicy

syncPolicy:
    automated:
      selfHeal: true
    syncOptions:
    - CreateNamespace=true
    - Prune=false
    - Replace=false

ArgoCD is able to detect new changes and I can see that in the UI, but its not syncing automatically - I need to manually click on sync button to sync it. Any idea where I’m going wrong. Thanks in advance.