Customising Okta Sign in Widget Error Messaging

Hi @James-Distology

You should be able to override using the i18n config for the widget:

var oktaSignIn = new OktaSignIn({
  baseUrl: 'XXXXX',
  clientId:'XXXXX',
  redirectUri:'http://localhost:3000',
  authParams: {
    display: 'page',
    responseType: 'id_token',
    responseMode: 'form_post',
    scopes: ['offline_access','email','profile','openid']
  },
  i18n: {
    en: {
      'errors.E0000004': 'Invalid Credentials'
    }
  }
}); 

You can see the keys for the i18n properties that you can override here: