I found a solution. You just need to put your Steam in offline mode, then start BO3 with Ezz.
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EsiCodFanZ
@EsiCodFanZ
Posts
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workshop contents problem -
workshop contents problemHello everyone,
I've noticed that the workshop contents haven't been showing up in the mods menu for the past four days. Even the custom maps aren't loading when I use the Ezz-boiii client. However, when I start the game from Steam, everything seems to be working fine. I haven't seen anyone else mention this issue, so I'm not sure if it's just me experiencing this problem.