Data not loading while using Youtube API in ionic4

I used Youtube api for fatching data from my channel. It works perfect while I use in browser view. but while I make build, and run in real ios device, It is not showing any videos. just loader is come which I put, while there is no response from POST method.

There is no error shows in xcode console. it just says below warnings/errors,

2019-11-14 10:12:18.768957+0530 GTPL[1658:114384] DiskCookieStorage changing policy from 2 to 0, cookie file: file:///private/var/mobile/Containers/Data/Application/487E7E0C-6DE9-4356-8239-C49CD7A44157/Library/Cookies/Cookies.binarycookies
2019-11-14 10:12:18.941517+0530 GTPL[1658:114384] Apache Cordova native platform version 5.0.1 is starting.
2019-11-14 10:12:18.942829+0530 GTPL[1658:114384] Multi-tasking -> Device: YES, App: YES
2019-11-14 10:12:18.982146+0530 GTPL[1658:114384] CDVWKWebViewEngine: trying to inject XHR polyfill
2019-11-14 10:12:21.768899+0530 GTPL[1658:114384] CDVWKWebViewEngine will reload WKWebView if required on resume
2019-11-14 10:12:21.769130+0530 GTPL[1658:114384] Using Ionic WKWebView
2019-11-14 10:12:21.770503+0530 GTPL[1658:114384] [CDVTimer][console] 0.200033ms
2019-11-14 10:12:21.770990+0530 GTPL[1658:114384] [CDVTimer][handleopenurl] 0.277996ms
2019-11-14 10:12:21.775266+0530 GTPL[1658:114384] Unlimited access to network resources
2019-11-14 10:12:21.775485+0530 GTPL[1658:114384] [CDVTimer][intentandnavigationfilter] 4.413962ms
2019-11-14 10:12:21.775789+0530 GTPL[1658:114384] [CDVTimer][gesturehandler] 0.241041ms
2019-11-14 10:12:21.782007+0530 GTPL[1658:114384] [CDVTimer][file] 6.067991ms
2019-11-14 10:12:21.783204+0530 GTPL[1658:114384] CDVIonicKeyboard: resize mode 1
2019-11-14 10:12:21.785072+0530 GTPL[1658:114384] [CDVTimer][cdvionickeyboard] 2.854943ms
2019-11-14 10:12:21.797875+0530 GTPL[1658:114384] [CDVTimer][splashscreen] 12.663960ms
2019-11-14 10:12:21.813145+0530 GTPL[1658:114384] [CDVTimer][statusbar] 14.961004ms
2019-11-14 10:12:21.813296+0530 GTPL[1658:114384] [CDVTimer][TotalPluginStartup] 43.213010ms
2019-11-14 10:12:27.600283+0530 GTPL[1658:114384] Ionic Native: deviceready event fired after 3059 ms
2019-11-14 10:24:01.951351+0530 GTPL[1658:114384] CDVWKWebViewEngine shouldReloadWebView::
2019-11-14 10:24:01.951546+0530 GTPL[1658:114384] CDVWKWebViewEngine shouldReloadWebView title: GTPL
2019-11-14 10:24:01.951585+0530 GTPL[1658:114384] CDVWKWebViewEngine shouldReloadWebView location: ionic://localhost/channels-list

Kidnly Help me with this, If there is something is missing from My end, or any Youtube API policy issue or anything else.

Thanks in advance.