I have encountered this situation. It should be that the electronic signature did not meet the system requirements.

The fundamental solution is to rely on back-end technology to improve the security and compatibility of the electronic signature system, which will not be discussed here; (the compatibility of U-Shield signatures of various banks is different, and the Market Supervision Administration has a technology It is not easy to achieve good compatibility with all signatures of various banks and consider the situation of each browser)

Prompt for abnormal signature verification service according to the version of Shenzhen Market Supervision Administration in October 2019 There will be two colors in the signature list on the left side of the PDF signature. The first one is red: it means there is no signature or there is a serious error in the signature. The second type is yellow or green: green indicates that the signature is fully serviceable, and yellow indicates that there is a problem with the signature, but it does not affect the authenticity of the signature. (You can try to submit if it is yellow)

First check whether all the signature lists on the left that require electronic signatures have been completed without omissions, that is, there should be no red prompts.

Second If it is all displayed in yellow or green, it means that the signature has been completed and can be submitted. Try submitting to see if it is successful.

Third, if all signatures are displayed without red items, and the submission of feedback fails. You can right-click on the specific signature point on the right to view the electronic signature properties. Under normal circumstances, the abbreviation of the bank name of the bank you use the U-Shield will be displayed. If there is a problem here, you can usually re-download the U-Shield browser plug-in of the bank and install it. Then re-sign. If it still doesn't work, go to the Agricultural Credit Union website (regardless of which bank's USB shield you use), then find the download section on the homepage, find a program called Signature Tool, download and install it, and then re-sign the PDF file and submit it. .