Game servers for SA-MP, FiveM, VC-MP and Liberty Unleashed

I can confirm since we usually play together, and now I have him added as a friend two times. https://i.imgur.com/Jy15VRQ.png

Hello, my friends account has glitched and the server doesn't recognize him any more. When he joined today he had to register again even when he is using the same ign as before. What can he do to get back all of his stuff back?

P.S. before you start wondering why he doesn't make a post, it's because his English ain't that good.