FiveM wants rockstar owned GTA

Hey guys, simple issue that I can’t seem to solve. FiveM wants a rockstar owned gta. I only have the epic games version. My epic games was downloaded from the Microsoft store if that makes any difference. Everytime I try boot it pulls up the rockstar games launcher, asks me to sign in and when I do it tells me that I can’t play cause I don’t have a rockstar owned GTA. Please help. Thanks