State issues with Zammad API

Hi @alrik.vidal. Please use the ticket history in the GUI.

Your request is missing the sender, then it works as expected:

{
  "title": "TEST",
  "type": "Request",
  "state_id": 1,
  "group_id": 1,
  "customer_id": "guess:test@mail",
  "article": {
    "sender": "Customer",
    "to": "test@mail",
    "subject": "TEST",
    "body": "I am a message!",
    "type": "email",
    "internal": "false"
  }
}