Solved , in ios just install schema_url plugin and that’s it , working like charm .
cordova-plugin-customurlscheme
Try this tutorial out:
https://firebase.google.com/docs/auth/web/cordova
@Perspecto I’m having the same issue. Neither facebook nor google authentication is working with my Ionic 4 app. I’m pretty certain it has to do with my hashkey but I’ve tried almost everything at this point. I re-added the hashkey to the facebook developers console. I’ve verified my webclientId
I’ve been stuck for weeks on this