If the account opening bank cannot be found in the online signature system of the Hebei Provincial Taxation Bureau, you can follow the following steps to solve the problem:

1. Confirm whether the input is correct: you need to confirm that you entered Is the account opening bank correct? If entered incorrectly, the system will naturally not be able to match it, so the account opening bank will not be found.

2. Try to manually enter the account opening bank information: If you confirm that there are no input errors, you can try to manually enter the account opening bank information. On the page for filling in account information, you can choose to manually enter the account bank information to complete the entry of the account bank information.

3. Contact the bank to confirm the information: If you still cannot find the account opening bank, you can contact the bank to confirm whether the account opening bank information is correct. At the same time, you can also contact the relevant staff of the local tax bureau for help and solutions.