Sign in with apple missing App Name in the permission message

I am trying to Sign in with Apple using Auth0.
But the permission message shows my app name as null

This is the permission message.

Do you want to sign in to null with you Apple ID "myAppleId@email.com"?

The logo of my app is showing correctly. It is the app name that is showing null

Where do I set the app name?

Edit: Here is how it looks -

If trying with Auth0, you can go with the following way to solve this problem.
Step 1.

if #available(iOS 13.0, *) {
    // Create the authorization request
    let request = ASAuthorizationAppleIDProvider().createRequest()

    // Set scopes
    request.requestedScopes = [.email, .fullName]

    // Setup a controller to display the authorization flow
    let controller = ASAuthorizationController(authorizationRequests: [request])

    // Set delegates to handle the flow response.
    controller.delegate = self
    controller.presentationContextProvider = self

    // Action
    controller.performRequests()
}

Step 2
Implement the delegate method and get apple's authorization code there.

extension ViewController: ASAuthorizationControllerDelegate {
    @available(iOS 13.0, *)
    func authorizationController(controller: ASAuthorizationController,
                                 didCompleteWithAuthorization authorization: ASAuthorization) {
        if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
            // Success
            guard let authorizationCode = appleIDCredential.authorizationCode,
                let authCode = String(data: authorizationCode, encoding: .utf8) else {
                    print("Problem with the authorizationCode")
                    return
            }
         }
    }
}

Step 3
Now you use this authCode to login to the Auth0.

func appleSignin(with authCode: String)  {
    Auth0.authentication().tokenExchange(withAppleAuthorizationCode: authCode)
        .start { result in
            switch result {
            case .success(let credentials):
            //LoginSucces
            case .failure(let error):
                //Issue with login.
            }
    }
}

In this method, you don't show the webview like for other login methods with Auth0.
I had posted this on Auth0 Community (the issue that I posted here), and one of their engineers replied me to approach it this way. Check this out for more info Sign in with Apple - Auth0