1, case-sensitive, numbers and letters, such as' 0' and' o', are easily confused. It is recommended to distinguish clearly before entering it correctly, or to change it into an easy-to-identify verification code for input confirmation. 2. When you log in again because of the wrong password input, the original verification code is invalid. Please refresh the page and re-enter. 3. Browser-Tools-Internet Options-Privacy is set to medium high or low.