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Error in HttpResponseMessage in GetAsync() while trying to retrieve accounts data after receiving access token HttpClient

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Posted on by meetdynamics

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Hi everyone,

I am trying to retrieve accounts data through WeAPI via Dynamics 365 On Premise which has IFD authetication. I am able to get the access token through adfsurl/.../token but when I pass the token and try to get some data using WebAPI, I am facing 401 unauthorized error. Here is my code :

var res = _httpClient.PostAsync(new Uri("">adfsurl/.../token"), content);
var respo = res.Result.Content.ReadAsStringAsync().Result;
accesstoken = JObject.Parse(respo).GetValue("access_token").ToString();
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer",accesstoken);

var response = _httpClient.GetAsync("">crmurl/.../WhoAmI").Result;

I am getting this error on the above line of code (StatusCode: 401, ReasonPhrase: 'Unauthorized')

Any help is highly appreciated. Thank you.

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meetdynamics 358 on at

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RE: Error in HttpResponseMessage in GetAsync() while trying to retrieve accounts data after receiving access token HttpClient

Hi Filipe,

Thanks for the response. We did registered the application on ADFS and tried to access D365 Web API, but we still got errors. Finally we switched to intergating using web services.

Anyways, thanks for helping me out.
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Filipe Relvas on at

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RE: Error in HttpResponseMessage in GetAsync() while trying to retrieve accounts data after receiving access token HttpClient

Hi Mithali,

For that scenario you might also need to register an application on ADFS. While the token is valid for direct access through the client an external app that requires access to the OrganizationService or the RESTful endpoint such as the WebAPI might require it.

I suggest to take a look at this:

docs.microsoft.com/.../walkthrough-register-app-active-directory

WebAPI sample that you might want to use:

docs.microsoft.com/.../mt779074(v=crm.8)

Hope this helps!