Problem with following the Auth0 "Quick Start" tutorial from my application homepage

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I appreciate your reply!

I don’t think I’m passing Client.Id explicitly because they didn’t do so in the tutorial. However, after receiving the error I tried looking online for examples of how to pass that value and I tried a few things to no avail. I’m not certain if I placed the call in the correct place or if I passed the correct value… but since it didn’t seem to work I have since commented out or erased these attempts.

I feel like it will probably make it a lot easier for me to be helped if I post a bunch of code snippets, so I’ll post a snippet at the bottom of this message. But please ask me for anything you might want to look at. I just don’t want to flood this thread right away with a bunch of irrelevant code since I’m not super certain about which files/sections will or won’t be relevant for sure.

Here is a link to the tutorial I’ve been using:
https://auth0.com/docs/quickstart/webapp/aspnet-core-3/01-login

And here is the snippet of the code which seems to be causing this error:

.AddOpenIdConnect("Auth0", options =>
        {
            // ...
            // options.ClientId = "mvc";
            options.Events = new OpenIdConnectEvents
            {
                // handle the logout redirection
                OnRedirectToIdentityProviderForSignOut = (context) =>
                {
                    var logoutUri = $"https://{Configuration["Auth0:Domain"]}/v2/logout?client_id={Configuration["Auth0:ClientId"]}";

                    var postLogoutUri = "https://localhost:44351/";
                    if (!string.IsNullOrEmpty(postLogoutUri))
                    {
                        if (postLogoutUri.StartsWith("/"))
                        {
                            // transform to absolute
                            var request = context.Request;
                            postLogoutUri = request.Scheme + "://" + request.Host + request.PathBase + postLogoutUri;
                        }
                        logoutUri += $"&returnTo={ Uri.EscapeDataString(postLogoutUri)}";
                    }

                    context.Response.Redirect(logoutUri);
                    context.HandleResponse();

                    return Task.CompletedTask;
                }
            };
        });