Error: Grant credentials are invalid

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Greg Bursett

• 2022年03月09日 23:32

I created a custom app with auth type = "OAuth 2.0 with Client Credentials Grant (Server Authentication)" and access type = "App access only" but I keep getting the error Grant credentials are invalid. I copy the creds right from the screen so I don't see how they can be invalid. My Client ID is "6hvihoiygmj1r00bs8gclv8f4jwhiqem". Any help would be appreciated.

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  Alex Novotny

  • 2022年03月10日 15:10

  This is probably happening due to what you are sending in with the authorization call. Check here for more information. With App Access Only, the subject type should be user not enterprise. 

  Alex, Box Developer Advocate

   

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  Greg Bursett

  • 2022年03月10日 16:08

  Thank you for the reply. The document you shared is the one I am using. I am getting the UserID from the General Settings tab and the OAuth 2.0 Credentials from the Configuration tab. Here is what I am attempting using .net box sdk:

  var boxConfig = new BoxConfigBuilder("6hvihoiygmj1r00bs8gclv8f4jwhiqem", "<secret>").Build();
              var boxCCG = new BoxCCGAuth(boxConfig);
              Task<string> response = boxCCG.UserTokenAsync("17293138289"); //valid for 60 minutes so should be cached and re-used
              while (!response.IsCompleted)
              {
                  //still waiting;
              }
              objBoxClient = boxCCG.UserClient(response.Result.ToString(), "17293138289");
              objBoxClient.Auth.SessionAuthenticated += delegate (object o, SessionAuthenticatedEventArgs e)

  I have also tried using Rest Sharp like this:

  RestRequest objRestRequest = new RestRequest("oauth2/token", Method.Post);
              objRestRequest.AddHeader("Content-Type", "application/x-www-form-urlencoded");
              objRestRequest.AddHeader("client_id", "6hvihoiygmj1r00bs8gclv8f4jwhiqem");
              objRestRequest.AddHeader("client_secret", "<Secret>");
              objRestRequest.AddParameter("grant_type", "client_credentials");
              objRestRequest.AddHeader("box_subject_type", "user");
              objRestRequest.AddHeader("box_subject_id", "17293138289");

              RestClient client = new RestClient("https://api.box.com");
              Task<RestResponse> response = client.ExecuteAsync(objRestRequest);

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