We are trying to configure a community site with external auth provider. We have a c# service that connects between an SSO service we have that is working with open id protocol and salesforce. This service is set as the external login/register. In the service, we see that we return an access token:
But the page we get to shows this error:
Error There was a problem with your authentication attempt. Please try again. If you continue to encounter problems, contact your administrator.
And the url shows this error:
Do you have any idea on how to continue from here?