my SalesIQ livechat integration failed to send chat on iOS

my SalesIQ livechat integration failed to send chat on iOS

Hi guys, I have a problem on SalesIQ livechat integration with my own iOS application. The chat from my iOS application can't send to the SalesIQ portal. But for the android version, it's working fine.

I have tried using the correct appKey and accessKey for iOS and exactly following the documentation here: 

I don't know what wrong with my iOS integration, but please correct me if there is a mistake from my side. Thank you.