Unfortunately not to much I can suggest from here… The cloud login process was developed without any specs, the error codes cryptic…
The only thing I can suggest, put the binding log to trace, it will show the actual response from the cloud. In there you can see a Chinese description of the error. Put that in Google translate and maybe it gives a clue what is the issue at hand.
Another user that had similar issues found that in his case the connectivity to one of the Chinese server was limited by his internet connection (during logon process it connects to 3 different servers)