Authorization is not allowed by Access-Control-Allow-Headers ios 13.4.1

I am trying to call Restful API on iPhone with .net backend .
Just for ios 13.4.1 I am getting the below error:
Request header field Authorization is not allowed by Access-Control-Allow-Headers
XMLHttpRequest cannot load http:***** due to access control checks.

Ionic:

ionic (Ionic CLI) : 4.2.1
Ionic Framework : ionic-angular 3.9.2
@ionic/app-scripts : 3.2.3

Cordova:

cordova (Cordova CLI) : 8.1.2
Cordova Platforms : ios 5.1.1
Cordova Plugins :cordova-plugin-advanced-http 2.4.1
cordova-plugin-ionic-webview 4.2.1

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