Mainland China participants receive error 13215 when joining my Zoom meetings

Participants in mainland China cannot join meetings hosted by my Zoom account. They receive error code 13215, stating that they cannot join due to restrictions on the host account. Participants in Japan can join normally.

I have confirmed that the “Allow or block users from specific countries/regions” setting is turned off. We have also tried both the full invitation link and manually entering the meeting ID and passcode, but the same error still appears.

Could you please advise whether my host account has a regional or platform restriction, and how this restriction can be removed?