question

I'm getting a problem when I've set up a matchmaking queue, The queue is called "FFA" and has no rules associated with it, its not set up for server allocation, so no region rule is set up. I call the create matchmaking ticket endpoint by calling:

https://846DB.playfabapi.com/Match/CreateMatchmakingTicket

with the json request:

{ 
	"Creator": { 
		"Entity": {
			"Id": "B3DB3A111A0034D", 
			"Type": "title_player_account", 
			"TypeString": "title_player_account"
 		}
 	}, 
	"GiveUpAfterSeconds": 120, 
	"QueueName": "FFA" 
}

When I submit this request, I get the error:
"The Entities for the creator do not match."
This returns a 2056 MatchmakingUnauthorized error code with.
What is the problem here? How do we solve this?

thanks