Have you customized the Okta Sign in page?
If you have customized the Okta Hosted Sign In Widget and added custom JavaScript to the login page, there is a possibility your customized JavaScript may not work after upgrading to Okta Identity Engine.

• Please check if you are using any of the deprecated JavaScript methods in the Okta Hosted Sign In Widget.

• Remediate all deprecated JavaScript methods

• Test your app and make sure the widget works OK.

• Learn More about upgrading with customized Okta Hosted Sign-in Widget

Are you hosting the Okta Sign in widget in one or more applications?
If you host the Okta sign in widget in your application or use the Okta SDKs for authentication or directly call the Okta Authentication , the user experience for your application will not change after the upgrade. However, those applications will still be using the Classic Authentication Pipeline after the upgrade. To take advantage of new Identity Engine features, additional steps will be needed.

• Upgrade your Okta Sign-In Widget to the latest version.

• Test your app to make sure the widget works OK.

• Make any necessary updates to the Sign-In Widget styling and i18n properties.

• Learn more about upgrading with the Embedded Okta Sign-in Widget

Have you Integrated Okta using SDKs?
The Okta SDKs have been updated to afford a tighter alignment with the capabilities introduced with Okta Identity Engine, If you do not shift to an Okta hosted Experience (anytime) or update your "Classic" SDK (post-upgrade) you will miss out on the new functionality.

• Add the appropriate Identity Engine SDK to your application code or update to the latest version of the Identity Engine SDK. See Add the latest Auth SDKs to your applications for detailed steps by language.

• Learn more about upgrading with the Embedded Okta SDK

Have you Integrated Okta using APIs?
The public Authentication APIs have evolved, If you do not move from the "Classic" /authn API to an Okta hosted Experience (anytime) or an OIE SDK (post-upgrade) you will miss out on new sign-in capabilities introduces with Okta Identity Engine.

• We recommend customers look at the latest release of the Okta Hosted Sign In Widget and move to Redirect...
  or look at hosting the Okta Sign In Widget in your application or use an Okta SDK that

• Learn More about upgrading with Embedded Okta Authentication API

To learn more, please review the links below or forward to the relevant teams.

Okta Developer Upgrade Overview: https://developer.okta.com/docs/guides/oie-upgrade-overview/main