Not in a game, but can't join queues after losing connection.
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I was playing a custom game but lost connection (network hardware issue). I exited SupCom and returned to the matchmaking screen under the 'Play' tab, but it says "Can't join queues while you are in game" - the game isn't even open.
I was able to fix it by logging out of FAF and opening the client again.
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I have had this too a number of times, sometimes solving it isn't trivial
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Use the superior python client.