1. First, go to the pass code detection station of the subway station as soon as possible and explain the situation to the staff.
2. Provide your own green code or identification to the staff so that they can verify your identity information.
3. After receiving the instructions from the staff, brush your green code again or provide other identification certificates to verify your identity again.
If you can't get into the subway station because of the wrong green code, you can consider using other means of transportation or looking for other modes of travel.
When dealing with such problems, it is suggested that you consult the subway station staff in time when you encounter any questions or confusion, so as to get correct help and guidance.