1. Incomplete or incorrect information. You can check again whether the information is complete. If the information is incorrect, you can fill it out again.
2. After passing the pre-examination, relevant materials need to be submitted to relevant departments for acceptance. Materials not submitted to the relevant departments will not be accepted.
3. If the pre-examination is passed but the acceptance time has not yet arrived, you can wait for a while before accepting it again.
4. If none of the above reasons apply, you can contact the relevant departments for consultation to learn the specific reasons and then solve the problem based on the reasons.
I hope the above information is helpful in answering your questions.