When I click play from the blizzard launcher the game says "Launching..." and then just eventually comes back to the play button. The game never starts, I get no error messages or anything.
This worked last week.
This is on Windows 10 Enterprise. i7-7600K, 16GB ram, Geforce GTX 1080
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How long did you wait? Also I sometimes have this problem but I just wait it out and the game will start.