Not able to initialise iOS SDK

When i am adding my key and secret key to your sample project i am not able to initialise sdk getting Error-8 (Over Time) error. Can you please help me in removing that error. And i want to add Custom UI over your UI Screen (Video Screen) can you please help me in getting this.

Hi @yadav.rajat,

Thanks for using Zoom SDK. What is the web domain you are setting?

Thanks!