matchRequest.matchAttributes not populating

Heya, I'm trying to do some matchmaking setup. Here's my CreateMatchRequest, which all seems to work fine:

Code (CSharp):

1.         CreateMatchRequest create = new CreateMatchRequest();
2.         create.name = SystemInfo.deviceUniqueIdentifier;
3.         create.size = maxPerRoom;
4.         create.advertise = true;
5.         create.matchAttributes = new Dictionary<string, long>();
6.         create.matchAttributes.Add("version", networkingVersion);
7.         create.password = string.Empty;
8.         matchMaker.CreateMatch(create, OnMatchCreate);

But on another computer, OnMatchListResponse, when I inspect the MatchDesc, the .matchAttributes.Count is always 0.

Am I doing this correctly?

 

Bump, not working in 5.2.1p3 either.