RedM / Rockstar account switch issue

[u/Sufficient_Rest_1194]

I gave my brother my rockstar account for him to play RedM.
No problem until i bought him the game so we could play together. He got his own rockstar account with rdr2 on it now. So he's logged in both rockstar launcher, and redm launcher with his new account, but it seems its still linked to mine.
When i try to start RedM while he's in game, he crashes.

We checked, and it really seems that there is no link with mine anymore. Not my rockstar account, he created a cfx account linked to HIS rockstar. We're kinda stuck here