I am using webapi it is working locally when I am deploying in IIS not getting response.

I have Async function in code is there any dependency when we host two web api's 1 is work at a time if one is down other service is working.

code snap:
[HttpPost]
public async Task<datatable> PendingCount(MAS_EMP_LOGIN objModel)
{
DataSet dsPendingCount = new DataSet();
dsPendingCount = await objBal.GetPendingCount(objModel);
if (dsPendingCount.Tables.Count == 0||dsPendingCount.Tables[0].Rows.Count == 0)
{
return DefaultDt("PendingCount", "0");
}
else
{
return dsPendingCount.Tables[0];
}
}

Response handler is

X-powered-by ASP.net inherited

Header info in Postman is

cache-control →no-cache
content-length →36
content-type →application/json; charset=utf-8
date →Wed, 23 Sep 2020 07:22:48 GMT
expires →-1
pragma →no-cache
server →Microsoft-IIS/8.5
x-aspnet-version →4.0.30319
x-powered-by →ASP.NET