In the Chinese discussion board, 60% of the people found to have this problem and the remaining 40% were normal.
See the return message indicating that 403 is an error caused by API validation
Finally, in reply to a sentence, China has not banned the API of WEMOD, so it is not necessary to use VPN. The authentication method from the API is probably caused by using the wrong credentials to initiate a request to the API. It may be that the legacy credentials of the old version were incorrectly submitted to the API or there was a problem in reading the local credentials, which led to the API denied access. It has nothing to do with the system firewall network. I hope you can improve the authentication mechanism of the API
If it were an issue with the credentials then everyone would be having an issue. It is likely due to a firewall rule on our side. I will confirm with the team tomorrow.