Account Identities linked are mixed with someone else's pc where I connected my FiveM acc in the past

What is the issue you’re having?

My cfx.re account was 1st connected to my personnal pc (where all my linked socials are also located and sync(identities)). I recently installed GTA 5 on my cousin’s PC, with my Rockstar account, and played FiveM with my account cfx.re account.
After I left, my cousin disconnected my rockstar account and connected his (bought GTA5 aswell), and came back to cfx with a new account he created - to play FiveM.

After that, neither of us needs to not have a cfx account connected to play simultaneously otherwise we are being disconnected (account already being used)
Each time I start FiveM (and he has fivem already running). I get mixed identities link, they mix randomly.

What have you tried already to fix the issue?

Deleting cache at : %localappdata%\FiveM\FiveM.app\data,
Deleting cache at : %appdata%\CitizenFX
Deleting cache at : %localappdata%\DigitalEntitlements
revoking access to every device in cfx acc preferences. Deleting token cache from the register editor for FiveM software. using win+r → regedit
(All that while having FiveM closed)

Restarting PC

What server did you get this issue on?

I got this issue on Cops & Robbers V and he got his issue on a French Harry Potter RP

Windows version

Windows 11 26200.7171

System specifications

CPU : AMD Ryzen 5 5600X 6-Core Processor (3.70 GHz)
GPU: RTX 4060
RAM : 32go 4000mhz

Antivirus software

Windows Defender

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