Go to Ubisoft.com and register. Use the name / PW then in SHIII. Worked for me...I had the same message while trying to create a account within SHIII.
You wont get a confirmation email !
Greetz
me ^^
€dit: The ingame-chat-key is NUMLOCK. Gave me a hard time to fintd THAT out -.-
Just in case ^_^
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