How to avoid redundant sign in on iOS app with a webview?

Users open our iOS app (currently in beta) for the first time, and sign in using Auth0 and their Facebook account or email address. That takes them to a screen in the app where they can do various things. If they then touch an icon in the app to go to a second screen, it takes them to a webview (within the app) that shows information from a webpage. Currently, they are required to log in to this webpage (the first time they use the app) after just having signed in to open an account to use the app.

This adds a lot of friction to their first use of the app, and we’d like to somehow use the data from their first sign in to prevent them from having to log in when they access the webview. Is there any way to do that?

I am too looking for the same problem. Any suggestion ??