Sandbox access violation: Blocked a frame in [email protected] cordova build

I have make build using cordova platform add [email protected] version but getting error when run on iphone device

I am trying to my web in iFrame and iFrame host in cordova app. (web framework is DNN(https://www.dnnsoftware.com))

Errors :

Sandbox access violation: Blocked a frame at "file://" from accessing a frame at "https://link1.site.com". The frame being accessed is sandboxed and lacks the "allow-same-origin" flag.

Refused to load https://link1.site.com/m/login.aspx?ReturnUrl=https://link1.site.com/m/Login.aspx because it does not appear in the frame-ancestors directive of the Content Security Policy.

SecurityError: Sandbox access violation: Blocked a frame at "file://" from accessing a cross-origin frame. The frame being accessed is sandboxed and lacks the "allow-same-origin" flag.

Used Version for Build

Cordova version : 12.0.0

cordova platform add [email protected] (For build command)

Xcode version : 26.0.1

Cocoapods version : 1.16.2

Node version : 20.19.5

HTML Code:

<iframe id="webiFrame" src="https://link1.site.com" sandbox="allow-same-origin allow-scripts allow-forms allow-popups" target="_parent" width="700" height="500"></iframe>

Cordova Config.xml File settings:

<preference name="AndroidInsecureFileModeEnabled" value="true" />
<access origin="*" />
 <allow-intent href="http://*/*" />
  <allow-intent href="https://*/*" />
  <allow-intent href="geo:*" />
  <platform name="android">
    <allow-intent href="market:*" />
  </platform>
  <allow-navigation href="*" />
  <platform name="ios">
    <preference name="AllowUniversalAccessFromFileURLs" value="true" />
    <preference name="AllowFileAccessFromFileURLs" value="true" />
  </platform>

DNN web(web config) settings:

<add name="Content-Security-Policy"
     value="frame-ancestors 'self' http://link1.site.com https://link1.site.com http://localhost:* file:// gap: capacitor://localhost;" />

Please tell me where is the problem and how to fix it?

Thank you