Troubleshooting API Connection Issues - Need Assistance

Hello, I have some problem when I'm using the api. Maybe I don't understand how it should work 😅 I create a conversation and get the cId and the mId from the response I call the endpoint to get events for a message with the parameters I'm testing the api with postman and the result is a "connection closed" directly It's working on dust api documentation. I don't know what I'm doing wrong 🤔 I spend several hours on that... Thanks for your help