firebase social login not redirected to the app , ionic 3 , ios

I believe the issue is related to ionic in iOS now defaulting to WKWebView (http://ionicframework.com/docs/wkwebview/) which has issues with Firebase. ionic native app URLs in iOS now appear as http://localhost instead of file://assets/.../index.html.

The suggested workaround at this time is to downgrade to UIWebView. Firebase Auth is looking into a solution for this.

I had the same issue, and changing the webview engine didn't solve it for me.

What worked for me was to add

<allow-navigation href="http://*" />

to config.xml.

I guess this worked for me because that localhost:8080/... link works over http, but I only had https://* allowed in my config.xml before that.

Not sure though why this is not an issue on Android, but hope this helps!