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Assets/Scripts/Client/ClientRequestGameEntrySystem.cs

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+using RpcComponents;
+using Unity.Burst;
+using Unity.Collections;
+using Unity.Entities;
+using Unity.NetCode;
+
+namespace Client
+{
+    [WorldSystemFilter(WorldSystemFilterFlags.ClientSimulation | WorldSystemFilterFlags.ThinClientSimulation)]
+    partial struct ClientRequestGameEntrySystem : ISystem
+    {
+        private EntityQuery _pendingNetworkIdQuery;
+    
+        [BurstCompile]
+        public void OnCreate(ref SystemState state)
+        {
+            //Get all entities connected to the server (having networkID), but not in game yet (no NetworkStreamInGame) 
+            var builder = new EntityQueryBuilder(Allocator.Temp).WithAll<NetworkId>().WithNone<NetworkStreamInGame>();
+            _pendingNetworkIdQuery = state.GetEntityQuery(builder);
+        
+            //only run system when entities with these components exist
+            state.RequireForUpdate(_pendingNetworkIdQuery);
+            state.RequireForUpdate<ClientTeamRequest>();
+        }
+
+        [BurstCompile]
+        public void OnUpdate(ref SystemState state)
+        {
+            //Get Requested team and all network ids that want to join
+            var ecb           = new EntityCommandBuffer(Allocator.Temp);
+            var requestedTeam = SystemAPI.GetSingleton<ClientTeamRequest>().Value;
+            var requestedColor = SystemAPI.GetSingleton<ClientTeamRequest>().Color;
+            var pendingNetworkIds = _pendingNetworkIdQuery.ToEntityArray(Allocator.Temp);
+
+            foreach (var pendingNetworkId in pendingNetworkIds)
+            {
+                //mark network ID as joined in game - it will receive Snapshots
+                ecb.AddComponent<NetworkStreamInGame>(pendingNetworkId);
+                var requestTeamEntity = ecb.CreateEntity();
+                
+                //Give entity Rpc command request and team request so that the server can handle it
+                ecb.AddComponent(requestTeamEntity, new TdTeamRequest
+                {
+                    Value = requestedTeam,
+                    Color = requestedColor
+                });
+                
+                ecb.AddComponent(requestTeamEntity, new SendRpcCommandRequest()
+                {
+                    TargetConnection = pendingNetworkId
+                });
+                
+                //Broadcast Rpc
+                ecb.Playback(state.EntityManager);
+            }
+        }
+
+        [BurstCompile]
+        public void OnDestroy(ref SystemState state)
+        {
+        
+        }
+    }
+}

Assets/Scripts/Client/ClientRequestGameEntrySystem.cs.meta

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+fileFormatVersion: 2
+guid: 9b0d42479451fa44dba6c499faf3ad02

Assets/Scripts/Client/ClientTeamRequest.cs

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+using Common;
+using Unity.Entities;
+using UnityEngine;
+
+namespace Client
+{
+    public struct ClientTeamRequest : IComponentData
+    {
+        public TeamType Value;
+        public Color Color;
+    }
+}

Assets/Scripts/Client/ClientTeamRequest.cs.meta

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+fileFormatVersion: 2
+guid: 02d9a6f5146a3da409cad66253e5af62