Same issue, my game launches but I get this error after 2-3min. Tried following actions:
reinstall game
reinstall anticheat
run everything as admin
added exception in windows defender and firewall (also disabled both)
restart machine many times
tried to launch from EA App, Steam, FC26.exe, FC26_trial.exe, EAAntiCheat.GameServiceLauncher.exe
copied EAAntiCheat.GameService.dll to system32
tried running in a fresh Windows profile
removed software that monitor PC temperature and performance
disabled overlay on Ea App
updated drivers
checked files integrety on Steam