404 error on OrgUri

I’m working with the example app from this article (Secure Your ASP.NET Web Forms Application with OpenID Connect and Okta | Okta Developer).
When I try to login in I get a 404 error looking for the file:
https://dev-ub1vjwadtn427xf5.us.auth0.com/oauth2/default/.well-known/openid-configuration

Hi there, the URL you are referring to us an Auth0 domain. Can you please confirm if you are using Auth0 or Okta domain in your configuration here Secure Your ASP.NET Web Forms Application with OpenID Connect and Okta | Okta Developer
As suggested, we recommend creating Okta developer account and setting up the application in Okta.

Ok, I guess I thought “Auth0 by Okta” and “Okta” were the same. I now have an Okta developer domain, but am getting this error:

Error: The response type is not supported by the authorization server. Configured response types: [code].

Can you try enabling Implicit flow → ID token for the application within Okta? .NET 4.x integrations use hybrid flow and will try to request id_token+code as the response type.