Microsoft.Azure.Cosmos.CosmosException: Response status 400

Question

I am trying to configure Services into Asp.net core Application while creating below excpetion throws

// This is my code
public void ConfigureServices(IServiceCollection services)
{
services.AddControllersWithViews();
services.AddSingleton<ICosmosDBService>(InitializeCosmosClientInstanceAsync(Configuration.GetSection("CosmosDb")).GetAwaiter().GetResult());
}

Exception :

Microsoft.Azure.Cosmos.CosmosException: 'Response status code does not indicate success: 400 Substatus: 0 Reason: (Exception of type 'Microsoft.Azure.Documents.DocumentClientException' was thrown., Windows/10.0.18362 cosmos-netstandard-sdk/3.3.0).'