IPs are generally (in Italy it works like this) dynamic. This means that if you restart/turn off your router (not your pc) for something like 30secs, turning it back on you'll receive a new IP address...Which will enable you not to be recognised by the registration-account server.
Create your account and enjoy playing with your father.
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You tried to multyaccount and the account creation server stopped you.
Create your account and enjoy playing with your father.