 Hey folks, we are answering frequently asked questions from the Octa Customer Identity Cloud community. And today, we are going to discuss how to resolve the error. Callback URL mismatch is not in the list of allowed callback URLs. Let's get started. This error occurs when the redirect URI value in the authorized request does not match one of the URLs configured as an allowed callback in your application settings. Here we are sending a redirect URI value of localhost 3000. This is where we would like to redirect back to after the user authenticates. The error is indicating that we need to add localhost 3000 to the list of allowed callback URLs for our application. To do this we will need to go to the dashboard and then go to our application settings page. We can scroll down to see application URIs and here we'll see the allowed callback URLs. We will enter localhost 3000 and then click save. Now we will go back to the application and test the login again. The error has been resolved and we are able to get to the login page. Today, we looked at how to resolve the error. Callback URL mismatch is not in the list of allowed callback URLs. If you found this video helpful, please like and subscribe to us on YouTube, and join us for more content on community.auth0.com.