There is no one definitive answer to this question as Duplicate ID can be caused by a variety of things, including errors made on your part, incorrect input, or simply a mistake made during the creation of your identity. However, some tips on how to fix Duplicate ID may include checking your identity documents for accuracy, correcting any errors that may have been made, and verifying that your social security number is correct. If you have any questions or concerns about your identity, please reach out to your identity management service or contact your bank.