Are you getting this message? http://imgur.com/YKDy1gU
If so then i got a possible fix for you!

If you go into your C: (or whatever drive you have the game installed on)
drive C:>programs(x86)>Ubisoft Game Launcher>Games>ForHonor
Once you are in the folder, then start up eac.exe (EasyAntiCheat) before you start up ForHonor. (Make sure EAC is running in Taskbar)
Now don't go into Uplay and start up the game, but under the same folder as we were in before (ForHonor folder)
Then you click on ForHonor.exe and it should work! (it took a couple of tries for me, but in the end it worked)

If this worked for you then go enjoy your game!