Modal Pop Up not working with anonymous user in sharepoint online public site

This is working when i am sign with user, but not working with anonymous user

I have been used SharePoint 2013 page like https://yoursitename-public.sharepoint.com/Pages/Contact-us.aspx

I have been insert <a id="contactusPopUp"></a> in page and modal dialog call from master page,

<script type="text/javascript">

$(document).ready(function(){
              
                $('#contactusPopUp').attr('href', 'javascript:openContactDialog()');

            });

function openContactDialog()
              {
                    
                    var options = SP.UI.$create_DialogOptions();
                    options.url = "https://yoursitename-public.sharepoint.com/Pages/TestContactUs.aspx";
                       options.title = "Contact Us";
                    options.autosize = true;
                    options.dialogReturnValueCallback = Function.createDelegate(null, CloseCallback);
                    void(SP.UI.ModalDialog.showModalDialog(options));
            }
            
            function CloseCallback(result, target) {
                
            }
</script>