Hi,
in my account, I already have a application for my web API in password mode. That work correctly. But I try to create a second application in WinForm C#. I download the test application (auth0-WinFormsWPF-oidc-samples-master\Quickstart\00-Starter-Seed\WinForms).
The application run, after un update to framework 4.7.2 and a nuget update. But when I try, my loginResult is always in error with this error
“Error validating token response: Identity token is missing on token response.”
But in auth0 account, I see the user is successfull
I try with “Username-Password-Authentication” and with “google-oauth2”. Same error. The user is create, but in Winform I receive this error. I try the WPF demo, same.
Unfortunatley, I am not familiar with WinForm C#, but it sounds like you may not be receiving the ID Token in the /oauth/token response. Have you tried specifying the openid scope?