Hi @ABY
Users in China, generally, may have trouble accessing cloud-based services. For that reason, companies with a globally distributed workforce - using web applications like Asana - often implement networking technologies and configurations like VPN, secure shell (SSH) tunneling, and proxy servers, in order to serve users from multiple geographic locations.
Ultimately, any company serving workers in mainland China will have to find a solution that works best for them.
Wish I had better news for you though it sounds like setting up a VPN is the best way to do so!