Jira Webhook not working in Jira Data Center

Hello, I am trying to configure a Jira Webhook with below parameters but the REST API endpoint is not getting triggered. Tried the same from Transition screen as well but from there also its not getting triggered. The same REST API call is working fine from Jira Listener so there is no network issue. Also this API does not require any authorization key to be passed.

Any help will be much appreciated.