Use React and Spring Boot to Build a Simple CRUD App

I greatly appreciate the tutorial as it really helped setup authentication quickly when first creating my combination react and spring application, though that brings me to ask a question,

Is there anything that should be noted when attempting to deploy an application following this tutorial? I am running into an issue where the deployed version of the application does not require a user to sign into the application in order to make a request to the API, where as the locally ran version does, and because of this, the method used to sign in doesn’t work.
When a user goes to sign in, it brings them to the standard login page from Auth0, and redirects back to the main page but does not retrieve the user data from Auth0 on that redirect, and any subsequent tries to “relogin” lead to a whitepage error on the backend. Any help would be appreciated for this issue!