Authenticat with Auth0 cases "This code is incorrect or expired" error on 3scale

Issue

• When I go to sign up to the 3scale developer portal via a signup with Auth0, I get "This code is incorrect or expired". The application is configured as a Regular web application with the token endpoint authentication method set to post in Auth0. The allowed callback URL is set as 3scale defined. All other settings are defaults. How do we proceed to get this working?