You may have registered successfully, so go in and see if the registration is successful after re-exiting, otherwise, why would he show duplication? If it is duplicate, you can delete the specified information. If you can't delete it, you can consult the corresponding person in this registration system and ask him to delete it.
Obviously, the real-name registration system will be strictly required to fill in personal data when entering Baidu. From your account, you can be sure that Baidu's tips and your current questions will be repeated when submitted. If the submission is unsuccessful, you will not ask questions here.