Extract the 100% save files. You will usually see files like User_XXXX.save .
This happens if you try to use a save from a much newer version of the game on an older game build. Ensure your game is updated to the latest version. forza horizon 5 codex save game 100 fix
Sometimes the game tries to create a new profile even if the ID matches. To force the fix: Turn off your internet connection. Delete the User.cfg file located in the save folder. Extract the 100% save files
If you are trying to use a downloaded 100% save file specifically for the CODEX version, follow these steps: forza horizon 5 codex save game 100 fix
Rename the folder inside the remote directory to match your AccountId exactly. 4. Bypass the "Cloud Sync" Conflict