What you want to ask is the reason why the scanning code signature of the public mine sign is undefined? API interface call error, signature verification failed.

1. Check whether the relevant API interfaces of the public cloud platform are called correctly in the code and whether the parameters are passed correctly. Check the code carefully to ensure that the API interface calls and parameters are correct.

2. This is caused by mismatched signature algorithm or signature verification failure. Check whether the signature algorithm meets the requirements of the public cloud platform and whether the signature is generated and verified correctly.