Server/RedeemMatchmakerTicket working on Unity Editor, not in Android device

Hi,

I'm trying to make a matchmaking system and when I get to the point to validate the ticket retrieved from Client.Matchmake I try to validate it calling ExecuteCloudScript which executes a "redeemMatchmakerTicket" function in my cloudscript. Here's the cloudscript code:

handlers.redeemMatchmakerTicket = function(args, context) {
	log.info("LobbyId received: " + args.LobbyId);
	log.info("Ticket received: " + args.Ticket);
	
	var redeemMatchmakerTicketResult = server.RedeemMatchmakerTicket({
		LobbyId : args.LobbyId,
		Ticket : args.Ticket
	});
		
	return redeemMatchmakerTicketResult;
};

And this is my C# code to call this cloudscript function:

private void RedeemMatchmakerTicket(string lobbyId, string ticket)
    {
        Debug.Log(ticket);
        PlayFabClientAPI.ExecuteCloudScript(new ExecuteCloudScriptRequest()
        {
            FunctionName = "redeemMatchmakerTicket",
            GeneratePlayStreamEvent = true,
            FunctionParameter = new
            {
                Ticket = ticket,
                LobbyId = lobbyId
            }
        }, OnTicketRedeemed, HandlePlayFabError);
    }

I get the lobbyId and the ticket from the Matchmake call.

Now, this works perfectly in the editor, here's a screen of the console log:

And when I build and try on an Android device, this occurs:

This is the error log in my Dashboard PlayStream:

{
    "EventName": "player_executed_cloudscript",
    "Source": "CloudScript",
    "FunctionName": "redeemMatchmakerTicket",
    "CloudScriptExecutionResult": {
        "FunctionName": "redeemMatchmakerTicket",
        "Revision": 17,
        "FunctionResult": null,
        "FunctionResultTooLarge": null,
        "Logs": [
            {
                "Level": "Info",
                "Message": "LobbyId received: 10708125309171672530",
                "Data": null
            },
            {
                "Level": "Info",
                "Message": "Ticket received: undefined",
                "Data": null
            },
            {
                "Level": "Error",
                "Message": "PlayFab API request error",
                "Data": {
                    "api": "/Server/RedeemMatchmakerTicket",
                    "request": {
                        "LobbyId": "10708125309171672530"
                    },
                    "result": null,
                    "apiError": {
                        "code": 400,
                        "status": "BadRequest",
                        "error": "InvalidParams",
                        "errorCode": 1000,
                        "errorMessage": "Invalid input parameters",
                        "errorHash": null,
                        "errorDetails": {
                            "Ticket": [
                                "The Ticket field is required."
                            ]
                        }
                    }
                }
            }
        ],
        "LogsTooLarge": null,
        "ExecutionTimeSeconds": 0.12422559999999999,
        "ProcessorTimeSeconds": 0.016,
        "MemoryConsumedBytes": 57960,
        "APIRequestsIssued": 1,
        "HttpRequestsIssued": 0,
        "Error": {
            "Error": "CloudScriptAPIRequestError",
            "Message": "The script called a PlayFab API, which returned an error. See the Error logs for details.",
            "StackTrace": "Error\n    at handlers.redeemMatchmakerTicket (99-main.js:27:44)"
        }
    },
    "EventNamespace": "com.playfab",
    "EntityType": "player",
    "TitleId": "99",
    "EventId": "98cba57ed6264e6d94d460683f2e34d9",
    "EntityId": "F354F89420254BA2",
    "SourceType": "BackEnd",
    "Timestamp": "2018-02-20T07:09:06.2293408Z",
    "History": null,
    "CustomTags": null,
    "Reserved": null
},
{
    "EventName": "player_executed_cloudscript",
    "Source": "CloudScript",
    "FunctionName": "deregisterGame",
    "CloudScriptExecutionResult": {
        "FunctionName": "deregisterGame",
        "Revision": 17,
        "FunctionResult": {
            "Message": {}
        },
        "FunctionResultTooLarge": null,
        "Logs": [
            {
                "Level": "Info",
                "Message": "LobbyId received: 10708125309171672530",
                "Data": null
            }
        ],
        "LogsTooLarge": null,
        "ExecutionTimeSeconds": 0.0871358,
        "ProcessorTimeSeconds": 0.016,
        "MemoryConsumedBytes": 28488,
        "APIRequestsIssued": 1,
        "HttpRequestsIssued": 0,
        "Error": null
    },
    "EventNamespace": "com.playfab",
    "EntityType": "player",
    "TitleId": "99",
    "EventId": "68d143d578f24b01b36203abd7f1b6d2",
    "EntityId": "F354F89420254BA2",
    "SourceType": "BackEnd",
    "Timestamp": "2018-02-20T07:09:06.7038029Z",
    "History": null,
    "CustomTags": null,
    "Reserved": null
}

So clearly there's something wrong when I try to send the ticket to the back-end. But just before I make the ExecuteCloudScript call I log the value and it's fine.

Any ideas? Thank you for your time.