Just quit the sc2 completely and restart the sc2 from the battel.net client to use the trainer for the second game with an another online player. In co-op mission, you have to wait until the other player quits before you open the trainer. Make sure you are the only player online within a game...
you could only use it in co-op after your teammate quits, otherwise you will expelled out of co-op mission and have the risk of getting your account banned. when the mission ends and xp is rewarded, quit the sc2 program and the trainer completedly and then restart the sc2 from the battle.net...
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