[flutter_auth] currentUser.refreshToken is empty on iOS and Android

[kurtinge]

I'm trying to fetch the refreshToken for the current logged in firebase user. However the refreshToken property is always empty.

The code I'm using is

final FirebaseAuth _auth = FirebaseAuth.instance;
String refreshToken = _auth.currentUser.refreshToken;
print(refreshToken);

Anyone know how or if it is possible to get the refresh token ? I need it to be able to login the user within a webview.

firebase_auth: "1.0.1