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You will need an active FiveM patreon license (Argentum, Aurum or Platinum) to use OneSync. You can purchase it directly from FiveM's patreon program.
In this tutorial we will explain how to enable OneSync Legacy for your FiveM server. With OneSync legacy you can set a maximum slot count of 128 depending on your license.
Login on your game panel
Click on Configuration -> Startup Parameters
Set Enable OneSync to 1