When using the solution 3(disable origin in game) you have to unhook your game and click it from the launcher.
Seems it have been working for you but then you got "the account or subaccount could not be found" means apparently now u have a login problem.
In Kane's Wrath you need to use you "Revora username" of if u registered with facebook, then put your "facebook username"
also check your "c&c online password" in your profile.
If you registered with facebook and your login still fail, ask to shorten your name
Are you trying to get online with a claimed nickname? If yes, maybe the database hasnt been updated, You need to login with a new online-id, thats means, simply enter any nickname u would like
Log files are in Windows > Temp > CNCOnline_Log.txt
PeaceGo to the full post