Some Chinese visa offices are refusing to issue visas to persons who are not resident in the country concerned. In some cases having a visa for that country is considered OK, but this might be of no help if you are in a country where you do not require a visa.

There is no simple answer to this issue, nor is it clear exactly why this rule exists. The first option is to try at every Chinese Consulate that you pass in the hope that one will grant a visa. Another possibility is that if you can manage without your passport for a couple of weeks, you express mail or courier your passport and application to a friend or agent in your own country and have it sent back to you when the visa has been issued.

for more information, please refer to the website https://www.travelchinaguide.com/embassy/visa/application.htm