Loading web page from mobile app with auth needs second login

We have Auth0 web login in our iOS app. In our case we need to load web page in application (WebView, SFController). Web page also has Auth0 login. When we load web page it prompt us to make second login.

We enable SSO, try to load web page in WKWebView and SFController, get cookies from app auth0 login and push them to WKWebView, get cookies from active browser session and push to WKWebView.

After we login second time in app WKWebView/SFController all subsequent loads don’t need login.

How to remove the necessity of login in WKWebView/SFController for the first web page load?