Same exact issue on my end. Game launches from EA App, Javelin Anticheat loads, the game window opens to a black screen, and it closes by itself after about 10 seconds with no error message.
I've already tried repairing the game, fully reinstalling it, reinstalling EA AntiCheat, updating my GPU drivers, disabling all overlays (NVIDIA, Discord), clearing my Documents\EA SPORTS FC 26 folder, and disabling cloud saves. None of it worked.
Reading your last reply where the same account fails on a different PC but a friend's account works on yours, I'm now suspecting this is account-related rather than hardware-related on my side too. Hoping EA can look into this since it seems to be affecting more than one user.
System for reference: Windows 11, Ryzen 5 4600, RTX 3050, 16GB RAM.