Dynamics 365 - Web Resources - Alert not displaying on form OnLoad

Hi,

Created a new Web Resource with the following code to display an alert onLoad  of a form.

    var Sdk = window.Sdk || {};

// Define some global variables
  

// Code to run in the form OnLoad event
     this.formOnLoad = function (executionContext) {
            var formContext = executionContext.getFormContext();
                alert('Hello World");
     }
// Code to run in the attribute OnChange event
     this.attributeOnChange = function (executionContext) {
             var formContext = executionContext.getFormContext();
     }

//  Code to run in the form OnSave event
             this.formOnSave = function () {
     }

}).call(Sdk);

All the calls are correctly configured
OnLoad Event:         Sdk.formOnload    &    Pass execution connect as first parameter
No errors when loading form

Any help is greatly appreciated.

Thanks