Getting an error when trying to authenticate using REST API Dynamics CRM with Azure AD

Question

I'm taking the following steps to access a Dynamics CRM Online REST API with Azure AD oAuth 2 Authentication:

- Registered a web app in Azure
- Configured the permissions to Dynamics CRM to have Delegated permissions "Access CRM Online as organization user"
- Created a Key with a 1 year expiration and kept the Client ID generated

After the web app was configured on Azure I created a Console app in .NET/C# that uses ADAL to make a simple request to retrieve a list of accounts: 
 

    class Program
{
    private static string ApiBaseUrl = "https://xxxxx.api.crm4.dynamics.com/";
    private static string ApiUrl = "https://xxxxx.api.crm4.dynamics.com/api/data/v8.1/";
    private static string ClientId = "2a5dcdaf-2036-4391-a3e5-9d0852ffe3f2";
    private static string AppKey = "symCaAYpYqhiMK2Gh+E1LUlfxbMy5X1sJ0/ugzM+ur0=";

    static void Main(string[] args)
    {
        AuthenticationParameters ap = AuthenticationParameters.CreateFromResourceUrlAsync(new Uri(ApiUrl)).Result;

        var clientCredential = new ClientCredential(ClientId, AppKey);

        var authenticationContext = new AuthenticationContext(ap.Authority);
        var authenticationResult = authenticationContext.AcquireToken(ApiBaseUrl, clientCredential);

        var httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authenticationResult.AccessToken);

        var result = httpClient.GetAsync(Path.Combine(ApiUrl, "accounts")).Result;         
    }
}

I can retrieve an access token successfully but when I try to do a httprequest to CRM I always get a 401 - Unauthorized status code. What am I missing?

Answer 1

Dynamics 365 has started to support Server-to-Server (S2S) authentication. So, this code should work when you create an application user. For more information about how to make this authentication work check this website: https://msdn.microsoft.com/en-us/library/mt790170.aspx

Hope it helps!

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