Maybe I'm missing something here. I signed up for an account where it says "Register" on the main page of ubi.com. I attempt to log in under the muliplayer section, it tells me "user ID not registered."
Am I just dumb for thinking that coming here and clicking "Register" means I'm registered? Is there some other registration that needs to take place? I do have the latest patch and PunkBuster; all that stuff that I apparently needed to use the multiplayer section. Hmmm...
I have the same problem since March.
I tried creating and using another account but that didn't work. Then I contacted the Ubi's technical support but it was completely useless — all they told me was that this thing is caused by the incompatibility between RvS and Windows 7 without even trying to tell how the game had been working flawlessly for several months before that.
I've had the same problem and there seems to be no logical explanation. But the solution I found with some help from my friend, was to just create a new uplay account and try with that. Same problem? Create a new account! Same problem again? Another account.. Untill you find an account that works. Yep it's completely unlogical and extremely buggy, but only thing that worked for me.