CrmServiceClient not working for OAuth type

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Hi Team,

Please find find below is the connection string format where OAuth not working. 

public static CrmServiceClient Connection()
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
//ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

string authType = “OAuth”;
string userName = “[email protected]”;
string password = “12345”;

string url = ““>”;

string appId = “51f81489-12ee-4a9e-aaae-a2591f45987d”;
string reDirectURI = “app://58145B91-0C36-4500-8554-080854F2AC97”;
string loginPrompt = “Never”;

string ConnectionString = string.Format(“AuthType ={0};Username ={1};Password ={2};Url ={3};AppId={4};RedirectUri={5};LoginPrompt={6}”,
authType, userName, password, url, appId, reDirectURI, loginPrompt);

CrmServiceClient svc = new CrmServiceClient(ConnectionString);
return svc;

I have tried below web.config option also :


<add key=”CRMConnectionString” value=”AuthType=OAuth; Username=[email protected]; Password=12345; Url=; AppId=51f81489-12ee-4a9e-aaae-a2591f45987d; RedirectUri=app://58145B91-0C36-4500-8554-080854F2AC97; LoginPrompt=Never”/>


Problem :- When I trying to call above function is will give below error, I have tried multiple blogs but that didn’t work in my case.

Unable to Login to Dynamics CRMOrganizationWebProxyClient is null
OrganizationWebProxyClient is nullOrganizationWebProxyClient is null
OrganizationWebProxyClient is nullOrganizationWebProxyClient is null

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