Unable to join servers on Bo2 due to "Challenge Verification Failed."
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Last night was just gonna try playing some Zombies and I got this error message for every server I had tried to join. Didn't occur for Solo. Same thing happens on both multiplayer and Zombies. No idea when this had became a problem as I hadn't opened up Plutonium in a good while. No errors appear in the console whenever I try to join a server. Thanks for reading!

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Challenge verification failed error
This is a known bug that happens because your username is too long.
Close the game and the launcher then change your username to 15 characters or less
https://plutonium.pw/docs/change-name/
This might be fixed in next updates but for now you have to do that -
Ah interesting. I never had this issue before so it must've become a thing whenever I took a small hiatus of this game. Thank you, now it works!
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