CreateChannel Response -> check if this is a problem
Have a look at "developerWarning"
{"success":true,"channel":{"fname":"TestChannel","msgs":0,"t":"c","u":{"_id":"n8SpX4zj6cKH2t6Fu","username":"TestAdmin"},"sysMes":true,"customFields":{},"name":"TestChannel","_id":"WfWTynNC293gTELnp","ro":false,"_updatedAt":"2018-01-02T11:03:06.270Z","ts":"2018-01-02T11:03:06.270Z"},"developerWarning":"[WARNING]: The "usernames" field has been removed for performance reasons. Please use the "*.members" endpoint to get a list of members/users in a room."}