This is an expected error. You may not update a game server's utilization status from UTILIZED to AVAILABLE.
This doc has a basic guideline on when to update your game server utilization status, down in "Update game server status": https://docs.aws.amazon.com/gamelift/latest/fleetiqguide/gsg-integrate-gameserver.html
In short, your game client will attempt to acquire a game server by calling ClaimGameServer. From there, either the Game Server Group will look for an AVAILABLE Game Server OR the given Game Server must be in AVAILABLE status. If an AVAIlABLE Game Server is found, in 60 seconds either the game client or game server needs to call UpdateGameServer to set that Game Server to UTILIZED.
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