Originally Posted by
Huntington7891
I don't mean to hijack after all this time, but I was looking for this exact error here after getting it on my end recently. In my case, I'm a first time user and the process was a doozy. I was just trying to directly connect my UPlay account because of the login field, and got this problem through the forums and the in game portals.
I don't know if your friend was in the exact same boat as me, but I ended up deciding to "register", which only consisted of logging in a username and password. Eventually, I just logged in my UPlay account afterwards without this error, and somehow the accounts successfully merged. I have no idea how that worked.
The exact reason for the error is really unknown to me at this time, but I would find it curious if the claim it's a conflict with UPlay as Gwalben is suggesting. Originally, I took this issue up in the Ubisoft forums, where I was directed to contact their support and they ultimately advised me it was on this end, not theirs. So, me having to do the dirty work without assistance and somehow get it working is quite a feat. I have no confirmation of the big question of why this error appeared in the first place. I can play now, but the process was a strange one.