Azure AD B2C Azure Mobile Services Xamrin Forms Example

Question

Looking for an example for Azure Mobile Services developed in Xamarin Forms that is authenticated through Azure AD B2C. I have a working solution where I am able to authenticate using Azure B2C in Xamarin Forms but unable to use the resulting token in Azure Mobile Services. See code snippet below:

public static PublicClientApplication AuthenticationClient { get; private set; }
public static MobileServiceClient MobileService = new MobileServiceClient(Constants.MobileServiceClientName);                  
result = App.AuthenticationClient.AcquireTokenAsync(
                        Constants.Scopes,
                        string.Empty,
                        UIBehavior.SelectAccount,
                        string.Empty,
                        null,
                        Constants.Authority, null);
                    JObject objToken = new JObject();
objToken.Add("authenticationToken", result.IdToken);

//I am successfully able to get an Id token for Microsoft, Google and Twitter providers but when I use the token to login to my Azure Mobile Service app, I get a "Not Authorized" error

MobileServiceUser user = await MobileService.LoginAsync(MobileServiceAuthenticationProvider.MicrosoftAccount, objToken);

Any and all ideas are appreciated.

See code changes to the above: objToken.Add("authenticationToken", result.IdToken); has been changed to objToken.Add("access_token", result.IdToken) and I have changed MobileServiceAuthenticationProvider.MicrosoftAccount to MobileServiceAuthenticationProvider.WindowsAzzureActiveDirectory — sidsud

sidsud sidsud · Accepted Answer · 2017-08-08T04:07:10

I was able to solve the issue. The Azure AD Provider configuration on my Azure Mobile App was not configured correctly.

Here is the corrected code:

public static PublicClientApplication AuthenticationClient { get; private set; }
public static MobileServiceClient MobileService = new MobileServiceClient(Constants.MobileServiceClientName);                  
result = App.AuthenticationClient.AcquireTokenAsync(
                        Constants.Scopes,
                        string.Empty,
                        UIBehavior.SelectAccount,
                        string.Empty,
                        null,
                        Constants.Authority, null);
                    JObject objToken = new JObject();
objToken.Add("access_token", result.IdToken);

//I am successfully able to get an Id token for Microsoft, Google and Twitter providers but when I use the token to login to my Azure Mobile Service app, I get a "Not Authorized" error

MobileServiceUser user = await MobileService.LoginAsync(MobileServiceAuthenticationProvider.WindowsAzureActiveDirectory, objToken);

I can provide more details on the Azure AD configuration if anyone is interested. So now, I have a fully working Xamarin Forms Azure Mobile App that is authenticated using Azure AD B2C and so far works with Microsoft, Google and Twitter providers.

Azure AD B2C Azure Mobile Services Xamrin Forms Example

1 Answers