What you want to ask is why the signature can't be displayed on the WeChat official account? Signature operation error, certificate problem, password input error.

1, use the wrong signature domain or use a U shield that doesn't belong to you.

2. If the certificate is expired, damaged or improperly installed, bring your ID card and bank card to the bank outlet for replacement or delete the original certificate and reinstall it.

3. For the data signature, you need to enter the corresponding numbers or letters on the password card, and you need to proofread them carefully to avoid mistakes.