I'm running into a frequent issue where my clients get stuck with the status WaitingForServer
I have 4 stand-by server instance but not work.
You can use Multiplayer Server - Get Build - REST API (PlayFab Multiplayer) | Microsoft Learn to check the server status and use Multiplayer Server - Request Multiplayer Server - REST API (PlayFab Multiplayer) | Microsoft Learn to check if a server is available. Referring to What does the matchmaker ticket "WaitingForServer" mean? (Matchmaking 2.0) - Playfab Community and Matchmaking "WaitingForServer" - Playfab Community, the issue may be caused by VM capacity cannot satisfy your frequent requests. You may try to change the “Maximum servers” option to a bigger value to see if this issue still happens.
Besides, servers will be free after they were shut down. You can shut down your game server following: Gracefully shutting down your game server.
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