Guys i found the solution
Solved for me - Mobile Hotspot fixed the Javelin error.
I was getting the exact EA Javelin AntiCheat error:
0xB3829EB7DE50BDB7
FC 26 would not launch at all.
I tried a full game reinstall, EA AntiCheat reinstall, clean boot, removing VPN and controller software, checking drivers, Windows troubleshooting, and other steps. Nothing worked.
What finally fixed it was changing the internet connection.
I completely closed the EA App and disconnected my PC from my normal home internet.
Then I enabled mobile data on my phone, turned on Mobile Hotspot, and connected my PC to the phone hotspot.
While still connected to the mobile hotspot, I opened the EA App and launched FC 26.
EA Javelin was then able to initialize correctly and the game launched successfully.
After FC 26 opened successfully once, I closed the game, switched back to my normal home internet connection, and the game continued to work.
So in my case, the problem appears to have been related to the network or ISP route used by EA Javelin during initialization or update, not corrupted game files or cheat-related software.
If anyone is getting the same error, try completely closing EA App, connecting the PC to a phone mobile hotspot using mobile data, and launching FC 26 while still connected to the hotspot.
Once the game launches successfully, try switching back to your normal internet connection.
This fixed the issue for me after many other troubleshooting steps failed.
Hopefully EA can investigate why Javelin fails on certain ISP or network routes, because the "unacceptable configuration" message was very misleading in this case.
