microsoft-authentication-library-for-android: AcquireTokenSilentAsync returns "Authority passed to silent parameters does not match with the cloud associated to the account."

I have a working app with a b2c configuration. Up until now I used the legacy b2c policy / authority URL’s: e.g. https://login.microsoftonline.com/tfp/<my-tenant>/B2C_1_SignUpPolicy.

Today I tried to change them to the new URL style: e.g. https://whatever.b2clogin.com/tfp/<my-tenant>/B2C_1_SignUpPolicy/

And suddenly I get the mentioned error from above when calling acquireTokenSilentAsync. I also compared with the sample app (https://github.com/Azure-Samples/ms-identity-android-java/) and couldn’t find a real difference.

I also started investigating myself and dug quite deep and found the exception is thrown here:

public class AcquireTokenSilentOperationParameters extends OperationParameters {
//.... what ever
    @Override
    public void validate() throws ArgumentException {
        super.validate();

        if (mAccount == null) {
            Logger.warn(TAG, "The account set on silent operation parameters is NULL.");
        } else if (!authorityMatchesAccountEnvironment()) {
            throw new ArgumentException(
                    ArgumentException.ACQUIRE_TOKEN_SILENT_OPERATION_NAME,
                    ArgumentException.AUTHORITY_ARGUMENT_NAME,
                    "Authority passed to silent parameters does not match with the cloud associated to the account."
            );
        }
    }

    private boolean authorityMatchesAccountEnvironment() {
        final String methodName = ":authorityMatchesAccountEnvironment";
        try {
            if (!AzureActiveDirectory.isInitialized()) {
                performCloudDiscovery();
            }
            final AzureActiveDirectoryCloud cloud = AzureActiveDirectory.getAzureActiveDirectoryCloudFromHostName(mAccount.getEnvironment());
            return cloud != null && cloud.getPreferredNetworkHostName().equals(getAuthority().getAuthorityURL().getAuthority());
        } catch (IOException e) {
            Logger.error(
                    TAG + methodName,
                    "Unable to perform cloud discovery",
                    e);
            return false;
        }
    }

I debugged into the method final AzureActiveDirectoryCloud cloud = AzureActiveDirectory.getAzureActiveDirectoryCloudFromHostName(mAccount.getEnvironment()); which returns null, because it contains only the following hosts:

my host (whatever.b2clogin.com) obviously doesn’t match there and therefore null is returned.

However I cannot believe that such a bug exists in this library. So I assume I configured something wrong. However I just can’t point my finger on what it could be.

Here is my configuration:

{
  "client_id": "whatever",
  "redirect_uri": "msalbwhatever://auth",
  "broker_redirect_uri_registered": false,
  "authorities": [
    {
      "type": "B2C",
      "authority_url": "https://whatever.b2clogin.com/tfp/whatever.onmicrosoft.com/B2C_1_SignInSignUpPolicy/",
      "default": true
    },
    {
      "type": "B2C",
      "authority_url": "https://whatever.b2clogin.com/tfp/whatever.onmicrosoft.com/B2C_1_SignUpPolicy/"
    },
    {
      "type": "B2C",
      "authority_url": "https://whatever.b2clogin.com/tfp/whatever.onmicrosoft.com/B2C_1_ResetPasswordPolicy/"
    }
  ],
  "account_mode": "MULTIPLE",
  "logging": {
    "pii_enabled": true,
    "log_level": "VERBOSE",
    "logcat_enabled": true
  }
}

Any help would be greatly appreciated!