Prerequisites

Create AWS Cognito User Pool

AWS SDK NuGet Packages

Open project in Visual Studio 2019 Community
Navigate to Tools > NuGet Package Manager > Packages for solution.
Install the following NuGet Packages:

Amazon.AspNetCore.Identity.Cognito
Amazon.Extensions.CognitoAuthentication

Visual Studio Implementation & Code

Open project in Visual Studio 2019 Community
Create a folder called 'Helpers' and sub folder 'AWS'
Create a class called 'CognitoHelper' in folder.

Sign Up

https://docs.aws.amazon.com/ses/latest/DeveloperGuide/request-production-access.html