Attempt to reuse auth token to connect xamarin app to azure fails - authentication

Question

This initial login succeeds:
public static MobileServiceClient MOBILE = new MobileServiceClient("https://myapp.azure-mobile.net/",myApplicationKey);
MobileServiceAuthenticationProvider GOOGLEPROVIDER = MobileServiceAuthenticationProvider.Google;
private async Task Connect() {
var USER = await MOBILE.LoginAsync(this, GOOGLEPROVIDER);
var CACHE = new Dictionary<string, string> { { "token", USER.MobileServiceAuthenticationToken } };
var ACCOUNT = new Account(USER.UserId, CACHE);
var STORE = AccountStore.Create(this);
STORE.Save(ACCOUNT, "Google");
}
but then this attempt to reuse the token to reconnect without a login page fails:
public async Task Reconnect() {
var STORE = AccountStore.Create(this);
var token = STORE.FindAccountsForService("Google").ToArray()[0].Properties["token"];
// token seems ok
var jsonToken = new JObject();
jsonToken.Add("access_token", token);
var USER = await MOBILE.LoginAsync(MobileServiceAuthenticationProvider.Google, jsonToken); // BOOM!
}
... with the following message: "The POST Google login request must contain both code and id_token in the body of the request."
What I am getting wrong here?

Answer 1

The token you use in the code, viz.
var CACHE = new Dictionary { { "token",USER.MobileServiceAuthenticationToken } };
The MobileServiceAuthenticationToken above is a token specific to MobileServices and cannot be used in the LoginAsync method (LoginAsync method requires a Google OAuth token.)
Please see this Get User Info from Google Api Using Azure Mobile Services for Xamarin Android