What data am I sending wrong in this request to broadcast a message?

Thank you, get-users worked and my id is the same as my channel id.

Still is it really not possible to do a test of sending a message to myself from the front end?

is that not possible?

I need to hire somebody to help me getting started. (if you are willing please send me private message)

New edit: I am using postman now to make the request, using the proper client_id and still get

{
“error”: “Forbidden”,
“status”: 403,
“message”: “Error (403): JWT could not be verified”
}

new edit 2: I am verifying my token here http://jwt.io and it returns verified. Could it be that my channel is not live? I don’t know what to think anymore