Hello @jonnathen.ravelo,
This does not look like the right URL. In our tutorials, if you check, we talk about installing SDKApp and access JWT as http://localhost:3000/api/users/sts
Please refer to : Unable to integrate the chatbot with the client/Mobile Channel Please Help us
We do not recommend using demo.kore.net as that is intended for Kore internal JWT service and it may go down without warning during internal maintenance.