我建立 Microsoft 帳號時誤將出生日期填成 2018 年，目前帳號被誤判為兒童帳號，生日無法修改，也無法退出家庭群組，請協助更正出生日期。

Sorry to hear about this situation. If your Microsoft account was created with an incorrect birth date, it will be treated as a child account, which means you cannot change the date of birth yourself or leave the Microsoft Family group. In this case, the birth date must be updated by the family organizer (adult account) who manages your account.

Microsoft agents are unable to change your account settings; only the Family organizer will be able to change the birth date in your account.