Unable to connect to the backend

[saharattallah]

Hi,
I'm building an EV charging management system using Django Channels and Websocket. I tested the app on Postman and it working fine but whenever I try to test it using the MicroOcpp simulator it fails to connect and I really don't know why. Please help me fix that.

Note: I have added the authentication token to the authorization key cell but I don't get connected too.