Call SharePoint Online rest api from console c# app with modern auth

Question

Hi ,

1) I am trying to call sharepoint search api from console app, in tenant only Modern authentication is active.
So i created Azure App and give there api permission ("AllSites.Read", "Sites.Search.All","Sites.Read.All", "Files.Read.All").
2) I am able to get auth token , but getting unauthorized error during api call , below is my code

           var defaultRequestHeaders = HttpClient.DefaultRequestHeaders;
           if (defaultRequestHeaders.Accept == null || !defaultRequestHeaders.Accept.Any(m => m.MediaType == 
               "application/json"))
            {
                HttpClient.DefaultRequestHeaders.Accept.Add( 
                  MediaTypeWithQualityHeaderValue.Parse("application/json;odata=verbose"));
            }
            defaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", accessToken);
            HttpResponseMessage response = await HttpClient.GetAsync(webApiUrl);
            if (response.IsSuccessStatusCode)

Answer 1

Hi @Dinesh Negi ,
I'm glad to hear you solve the problem ,if you have any issue about SharePoint, you are welcome to raise a ticket in this forum.

By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others." and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:

[Call SharePoint Online rest api from console c# app with modern auth]

Issue Symptom:

1. I am trying to call sharepoint search api from console app, in tenant only Modern authentication is active.
   So i created Azure App and give there api permission ("AllSites.Read", "Sites.Search.All","Sites.Read.All", "Files.Read.All").
2. I am able to get auth token , but getting unauthorized error during api call

Current status:
After nuget upgraded with Microsoft.identiy.model version verion v 4.4.1. Now able to fix this issue.

You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member's to see the useful information when reading this thread. Thanks for your understanding!

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Answer 2

Hi @Dinesh Negi ,
Thanks for your detailed case description.
According to my research and testing, please check whether the Client ID and Secret are correct, or the token is correct and check the requested URL. They usually result in an unauthorized error.

Here is a document about how to call SharePoint Online REST API from console application. You can refer to.

Reference:
https://www.c-sharpcorner.com/article/consume-sharepoint-online-csom-rest-api-with-dotnet-core-3-1/

Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.

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Answer 3

Hi @Tong Zhang_MSFT ,

As i said , i was able to get access token, so Client ID and Secret should be correct.

After nuget upgraded with Microsoft.identiy.model version verion v 4.4.1

Now able to fix this issue.

Thanks, For your help and research.