What is the reason for the wrong user name and password when the digital paradise handheld portal business logs in on the mobile terminal?

The user name and password errors reported by the terminal login may be caused by the following problems: (1) The original system could not log in due to password expiration and password error; (2) The original business system can't communicate with the mobile OA platform; (3) The mobile phone did not dial successfully, or confirm whether the data network was opened. (The above content is only applicable to Guangdong Unicom users)