solve:
1. Verify that the signature is correct, download the software for obtaining the signature provided by the open platform , and obtain your own signature. Special attention: the signature mentioned by the open platform is not the signature sha1 value, but the md5 value of the signature file. , set it to your App on the open platform.
2. If you have run the app before, don't hesitate, restart your phone, and re-call WeChat to log in, it will work, you don't have to wait a day or 5 hours, it will take effect immediately.
The pit that has been stepped on, share it.