Why can't my attendees from China join my meeting?

[SKaur]

I am a healthcare professional with a Pro Account of Zoom. I am able to host meetings without issues to my international clients except from China. For some reason, my attendees from China are unable to join the meeting and are shown a restriction message. I find that unusual and hoping to find a solution to fix this. 

[yej2ezy]

I am experiencing the same problem, people are gettin error 13215 when dialing in from China

[Calvo]

@both
Try to use the Network Connectivity Tool to get more information about your issues and please post the result.
I would also ercommend to open a case on Zoom support in parallel.
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0058114#h_01GT30TR8Y8CJRTTM79X8YVH...