404 Error when using web widget

We use web widget on our site vocabulary.com, however, each time we load a page using the widget we see a 404 error. This is the error we see.

https://vocabulary.zendesk.com/talk_embeddables_service/web/status?subdomain=vocabulary&nickname=Phone%20Support

The setttings we use in the widget are posted in the code snippet below.

var settings = window.zESettings = {

  webWidget: {

color: {

launcher:'#4db538',

button:'#4db538',

header: '#6182a8',

resultLists: '#22558A',

articleLinks: '#22558A'

},

    contactForm: {

      attachments: false,

      title: { '*':'Contact Us' }

    },

    helpCenter: {

    title: {

        '*': 'Search help articles'

    }

    },

    talk: {

        suppress: true,        

    },

    chat: {

        suppress: false,

        hideWhenOffline: true

    },

    contactOptions: {

    enabled: true,

    contactButton: { '*': 'Contact Us' },

    contactFormLabel: { '*': 'Contact Us' }

    }

  }

};

We do not explicitly call vocabulary.zendesk.com/talk_embeddables_service as a request in our codebase. It is likely a request automatically called by the widget, and it throws a 404 every time. Any advice on what might be going on?