ClientRpc sent but not received

I'm working on a simple multiplayer game using the NetworkLobbyManager.

Here's my workflow:

1) In the NetworkLobbyManager's OnLobbyServerPlayersReady(), I do some initialization to GameHandler, a child GameObject with the GameController script.
Then, I load the play scene using ServerChangeScene(playScene);.

2) In the play scene, a Player object with the GamePlayerController script is loaded for each client (linked as the Player object in the NetworkLobbyManager). In the Start() method, I do some initializations and send a Command to the server, telling them the client is loaded:

 [ClientCallback]
 void Start() {
     // some initialization
     CmdCourseLoaded();
 }

 [Command]
 void CmdCourseLoaded() {
     gameController.OnPlayerLoaded(this);
 }

3) Once GameController#OnPlayerLoaded was called for all clients, it sends out an RPC telling them that the game started:

 foreach (GolfPlayerController player in players) {
     Debug.Log("Send RPC");
     player.RpcMapLoaded();
 }

I'm currently testing this with only the host (i.e. only one client as well) and while the RPC gets sent out by the GameController, it is never received by the client GamePlayerController. Could this be because the GamePlayerController is not set up to receive RPCs yet? If so, how could I set up my project to fix this?

I've found several similar issues but none of the solutions seemed to work. Any suggestions would be appreciated!