Two brother same connection same ip, vpn didn't work

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GTA V version?
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Did you try to delete caches.xml and try again?
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What server did you get this issue on?
CitizenFX.log file
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Hello we are 2 brother’s and we can’t play same server for ip problem, we try to change whit vpn, but didn’t work, anyone of you guy’s can help us?

Ask the server owner for support, if they don’t allow two people to play using the same IP then they setup a crap user system. Since this isn’t a FiveM issue, I’m closing this topic.