Okta Hosted Custom Sign In Widget - transformUsername

Hi,

I’m just wondering if someone is able to assist me with getting the transformUsername function to work with the Okta hosted custom sign in widget. For the life of me i can’t get it to append the domain suffix onto the username.

For context, im using a trial okta tenant with my custom domain setup and the default configuration for the sign in widget, with only the transformUsername function added in. Widget code is below:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="robots" content="noindex,nofollow" />
    <!-- Styles generated from theme -->
    <link href="{{themedStylesUrl}}" rel="stylesheet" type="text/css">
    <!-- Favicon from theme -->
    <link rel="shortcut icon" href="{{faviconUrl}}" type="image/x-icon" />

    <title>{{pageTitle}}</title>
    {{{SignInWidgetResources}}}

    <style nonce="{{nonceValue}}">
        #login-bg-image-id {
            background-image: {
                    {
                    bgImageUrl
                }
            }
        }
    </style>
</head>

<body>
    <div id="login-bg-image-id" class="login-bg-image tb--background"></div>
    <div id="okta-login-container"></div>

    <!--
        "OktaUtil" defines a global OktaUtil object
        that contains methods used to complete the Okta login flow.
     -->
    {{{OktaUtil}}}

    <script type="text/javascript" nonce="{{nonceValue}}">

        transformUsername: (username, operation) => {
            // This example will append the '@acme.com' domain if the user has
            // not entered it
            return username.includes('@acme.com')
                ? username
                : username + '@acme.com';
        };
        // "config" object contains default widget configuration
        // with any custom overrides defined in your admin settings.
        var config = OktaUtil.getSignInWidgetConfig();

        // Render the Okta Sign-In Widget
        var oktaSignIn = new OktaSignIn(config);
        oktaSignIn.renderEl({ el: '#okta-login-container' },
            OktaUtil.completeLogin,
            function (error) {
                // Logs errors that occur when configuring the widget.
                // Remove or replace this with your own custom error handler.
                console.log(error.message, error);
            }
        );
    </script>
</body>

</html>

Any assistance would be greatly appreciated, as im trying to see if this will solve an issue for us.

Can you try the following to see if this helps

 config.transformUsername = function(username,operation) {
              value = 'abc@' + username;     
              return value
          }