Custom Matchmaking: Players not showing up in Active Games

Hi -

I already have a matchmaking server in-place, so I wanted to make use of the PlayFab Matchmaking API to reflect the status of the players and be able to view it in the dashboard. After trying a few things, I'm either misunderstanding some of the docs, or there might be a bug with one of the calls. Using the PostMan collection, I'm able to reproduce the sequence of events. Here's what I'm doing

1. Create a GameMode/Version combo in Multiplayer. In this case I'm using Survival/test-version

2. Call Server/RegisterGame

{
    "code": 200,
    "status": "OK",
    "data": {
        "LobbyId": "5174896170163967513"
    }
}

As expected, I can see the server in the "Active Games" tab, with the details specified.

3. Call Matchmaker/PlayerJoined with the LobbyId (returned in #2) and a valid PlayFabId

{
  "LobbyId": "5174896170163967513",
  "PlayFabId": "2EEE6BD3EB131348"
}

Response:

{
    "code": 200,
    "status": "OK",
    "data": {}
}

At this point, I'd expect to see the player listed under "Players" in the "Active Games", but they're not showing up. Am I missing something here?

Thanks!

-Courtland

PS Thank you so much for the PostMan collection. Makes testing things super easy!