Why it gives me bad request while I'm trying to create new ticket using postman

Why it gives me bad request while I'm trying to create new ticket using postman

Currently I'm trying to create a new ticket, I set the subject, departmentId and contactId the required fields and it is still give me error: 400 Bad Request.

I set the orgId and Auth. Key also, I can display Tickets, but I can't create new ticket.


Thank you