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The Duplicate Code Error indicates that the verification code entered by the user has already been used or has expired. This may happen if the user takes too long to enter the code or if they attempt to use a previously used code. To resolve this issue, the user should request a new code and enter it within the allotted time window. Additionally, it is recommended to ensure that the time on the user's device is synced correctly to avoid any issues with time-based codes.