Iv'e been trying to add my younger brother's account to the family pack. I have the right password and email, but when given the option of 'do you want to join this family- yes or no', pressing yes comes up with an error. The error says ' Can't sign into your microsoft account. Please try again later.' It also gives a website to go to if the problem continues, which is absolutley USELESS. What do I have to do?