braintree hosted payment fields client undefined Ember 3.25

Ember and Braintree Hosted Fields are not a good mix so far, Braintree Support are out of ideas on this one. When the form renders on the page it calls the action to create the client. The client is undefined. The live page is up here.

picture-this-44ac48bef9f8df633632a4d202da2379.js:57 Uncaught TypeError: Cannot read property 'client' of undefined

component hbs

<script src="https://js.braintreegateway.com/web/3.81.0/js/client.min.js"></script>
<script src="https://js.braintreegateway.com/web/3.81.0/js/hosted-fields.min.js"></script>
<div class="demo-frame" >
  <form action="/" method="post" id="cardForm" >
    <label class="hosted-fields--label" for="card-number">Card Number</label>
    <div id="card-number" class="hosted-field"></div>

    <label class="hosted-fields--label" for="expiration-date">Expiration Date</label>
    <div id="expiration-date" class="hosted-field"></div>

    <label class="hosted-fields--label" for="cvv">CVV</label>
    <div id="cvv" class="hosted-field"></div>

    <label class="hosted-fields--label" for="postal-code">Postal Code</label>
    <div id="postal-code" class="hosted-field"></div>

    <div class="button-container">
    <input type="submit" class="button button--small button--green" value="Purchase" id="submit"/>
    </div>
  </form>
</div>

component class

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';
import { tracked } from '@glimmer/tracking';
import { braintree } from 'braintree-web';

export default class CardPaymentComponent extends Component {

  @action
  setupBraintreeHostedFields() {

    alert('booh');
    var form = document.querySelector('#cardForm');
    var authorization = 'sandbox_24nzd6x7_gyvpsk2myght4c2p';

    braintree.client.create({
      authorization: authorization
    }, function(err, clientInstance) {
      if (err) {
        console.error(err);
        return;
      }
      createHostedFields(clientInstance);
    });

    function createHostedFields(clientInstance) {
      braintree.hostedFields.create({
        client: clientInstance,
        styles: {
          'input': {
            'font-size': '16px',
            'font-family': 'courier, monospace',
            'font-weight': 'lighter',
            'color': '#ccc'
          },
          ':focus': {
            'color': 'black'
          },
          '.valid': {
            'color': '#8bdda8'
          }
        },
        fields: {
          number: {
            selector: '#card-number',
            placeholder: '4111 1111 1111 1111'
          },
          cvv: {
            selector: '#cvv',
            placeholder: '123'
          },
          expirationDate: {
            selector: '#expiration-date',
            placeholder: 'MM/YYYY'
          },
          postalCode: {
            selector: '#postal-code',
            placeholder: '11111'
          }
        }
      }, function (err, hostedFieldsInstance) {
        var tokenize = function (event) {
          event.preventDefault();

          hostedFieldsInstance.tokenize(function (err, payload) {
            if (err) {
              alert('Something went wrong. Check your card details and try again.');
              return;
            }

            alert('Submit your nonce (' + payload.nonce + ') to your server here!');
          });
        };

        form.addEventListener('submit', tokenize, false);
      });
    }

  }

}

package.json

...
"ember-cli": "^3.25.2",
"braintree-web": "^3.81.0",
...