Thank you, indeed it might be related to plugins, when I start to build [GameName]Editor with XCode I get the error : "Module ‘Qos’ (Engine Plugins) should not reference module ‘OnlineSubsystemUtils’ (Project). Hierarchy is project → Marketplace → Engine Programs → Engine Plugins → Engine.
But I’ve already removed the line “OnlineSubsystemUtils” from the PrivateDependecyModuleNames of the Qos.Build.cs file so I don’t get why I still get that error. Is there a step I missed for my change to be applied ?