Can not create Ticket without owner

[beckolli]

You are not able to create a ticket without setting OwnerId.
OwnerId is not nullable, if OwnerId is 0 you will get an 422.

public class Ticket
{
    [JsonProperty("id")]
    public int Id { get; set; }
...

    [JsonProperty("owner_id")]
    public int OwnerId { get; set; }
...
}