Unity GameKit Plugin w/ Matchmaking Queue is not working

TLDR; I can't get QueueName to work with matchmaking a turn-based match in Unity using matchmaking rules.

Long version:

I'm using the apple unity plugin found here: https://github.com/apple/unityplugins/blob/main/plug-ins/Apple.GameKit/Apple.GameKit_Unity/Assets/Apple.GameKit/Documentation~/Apple.GameKit.md

I have created a Queue, RuleSet and a simple Rule to match players by following these docs tightly: https://developer.apple.com/documentation/gamekit/finding-players-using-matchmaking-rules.

Here is the single rule I have that drives matchmaking:

{
  "data" : {
    "type" : "gameCenterMatchmakingRules",
    "id" : "[hiddden-rule-id]",
    "attributes" : {
      "referenceName" : "ComplimentaryFactionPreference",
      "description" : "default desc",
      "type" : "MATCH",
      "expression" : "requests[0].properties.preference != requests[1].properties.preference",
      "weight" : null
    },
    "links" : {
      "self" : "https://api.appstoreconnect.apple.com/v1/gameCenterMatchmakingRules/[hidden-rule-id]"
    }
  },
  "links" : {
    "self" : "https://api.appstoreconnect.apple.com/v1/gameCenterMatchmakingRules"
  }
}

which belongs to a rule set which belongs to a queue. I have verified these are setup and linked via the App Store Connect API. Additionally, when I tested queue-based matchmaking without a queue established, I got an error in Unity. Now, with this, I do not. However there is a problem when I attempt to use the queue for matchmaking.

I have the basic C# function here:

		public override void StartSearch(NSMutableDictionary<NSString, NSObject> properties)
		{
			if (searching) return;

			base.StartSearch(properties);

			//Establish matchmaking requests

			_matchRequest = GKMatchRequest.Init();

			_matchRequest.QueueName = _PreferencesToQueue(GetSerializedPreferences());

			_matchRequest.Properties = properties;

			_matchRequest.MaxPlayers = PLAYERS_COUNT;

			_matchRequest.MinPlayers = PLAYERS_COUNT;

			_matchTask = GKTurnBasedMatch.Find(_matchRequest);
		}

The

_PreferencesToQueue(GetSerializedPreferences());

returns the exact name of the queue I added my ruleset to.

After this function is called, I poll the task generated from the .Find(...) function. Every time I run this function, a new match is created almost instantly. No two players are ever added to the same match.

Further, I'm running two built game instances, one on a mac and another on an ipad and when I simultaneously test, I am unable to join games this way.

Can someone help me debug why I cannot seem to match make when using a queue based approach?