TokenCache doesn't work with B2C authorities after migrating to MSAL 2.0.0-preview

I made to following steps for migration from v1.1.4 to 2.0.0:

• Enable embedded WebView: App.Services.UiParent = new UIParent(this, true);
• Switch from IUser to IAccount
• Changed the AcquireTokenSilentAsync from AuthenticationResult = await PCA.AcquireTokenSilentAsync( Scopes, GetUserByPolicy(PCA.Users, PolicySignUpSignIn), Authority, false); to var accounts = await PCA.GetAccountsAsync(); AuthenticationResult = await PCA.AcquireTokenSilentAsync(scopes, accounts.FirstOrDefault());
• Changed the AcquireTokenAsync method from AuthenticationResult = await PCA.AcquireTokenAsync( Scopes, GetUserByPolicy(PCA.Users, PolicySignUpSignIn), App.Services.UiParent); to AuthenticationResult = await PCA.AcquireTokenAsync(scopes, App.Services.UiParent);

The TokenCache is not given in my PCA constructor: PCA = new PublicClientApplication(ClientId, Authority) { RedirectUri = $"msal{ClientId}://auth" };

Used Plattform and libraries:

• Xamarin.Forms v3.1.0.697729
• Android Support Libraries: 27.0.2.1

I tried Android (6.0) and UWP, both need an explicit login action to get an AuthenticationResult. PCA.GetAccountAsync() always returns an empty list, so in my view it seems to be an error with the TokenCache.

Do I need to delete the old v1.x-Cache in some way? Can you reproduce the error?

[jmprieur]

@Daniel-NP : I was able to repro it. (in other B2C tenants as well) What I observe is that:

• I can get a token interactively (both an access token and an idToken), but the Account member of the AuthenticationResult has the following characteristics (different from what we have for the AAD tokens):
  • the Username is null
  • the AccountId’s ObjectID contains the policy : ObjectId = “<guid>-b2c_1_susi” Then indeed, as you observed, this account is not added to the token cache.

Also the claims included in the idToken are different than the claims included in the AAD idToken, and I believe some of them are needed for indexing the cache

We are working on a solution, meanwhile, I’ll advise that you to keep using MSAL 1.1.4 -preview.. We’ll update you with this GitHub issue.

Thanks again for reporting and sharing your repros. I’m renaming the issue to have B2C in the title

[trwalke]

We have implemented a fix for this issue and we are planning to release within the next week or so