Data center location other than US cause Error 110.

[Mohammad-Taqi]

When we have Data center Location as Germany or Singapore than IRtcEngineEventHandler throws this error having code 110.
Due to this we are not able to make voice or video call.

(Data center location option when you config CHAT for the first time)

[ycj3]

It seems when you changed chat appkey without obtained the correct rtc token.
Cause 110 error occurs when the rtc token is invalid, refer to this api reference

Note that: RTC token should be genetated from App Server.
You can check the RTC token logic and try again.