Firebase Facebook login error iOS only "auth/operation-not-supported-in-this-environment"

Hi all,

I’m following this guide to add Firebase social login to my Ionic v 4 app:

https://firebase.google.com/docs/auth/web/cordova

On Android, everything works fine. On iOS I get:

ERROR: {“code”:“auth/operation-not-supported-in-this-environment”,“message”:“This operation is not supported in the environment this application is running on. “location.protocol” must be http, https or chrome-extension and web storage must be enabled.”}

Has anyone had success with this?

ionic info:

Ionic:

Ionic CLI : 5.2.1 (/Users/–/.nvm/versions/node/v12.6.0/lib/node_modules/ionic)
Ionic Framework : @ionic/angular 4.6.0
@angular-devkit/build-angular : 0.13.9
@angular-devkit/schematics : 7.3.9
@angular/cli : 7.3.9
@ionic/angular-toolkit : 1.5.1

Cordova:

Cordova CLI : 9.0.0 (cordova-lib@9.0.1)
Cordova Platforms : android 8.0.0, ios 5.0.1
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.1.1, (and 15 other plugins)

Utility:

cordova-res : 0.6.0
native-run : 0.2.7 (update available: 0.2.8)

System:

ios-deploy : 1.9.4
ios-sim : 8.0.1
NodeJS : v12.6.0 (/Users/–/.nvm/versions/node/v12.6.0/bin/node)
npm : 6.9.0
OS : macOS High Sierra
Xcode : Xcode 10.1 Build version 10B61