Cognito Authorization using ASP.Net Core

Question

I'm trying to get my ASP.Net Core Web App to authenticate/authorize using AWS Cognito.  I'm using the following example as a guideline: https://github.com/aws-samples/aws-netcore-aspnetmvc-amazon-cognito-authentication-authorization-samples

So far, I haven't been able to get the sample working and I've noticed at least one other person who has a similar issue redeeming the token.

I'm using Visual Studio 2022 and have migrated to the latest version of .Net.

When I attempt to login, I'm getting the following, any idea what might be wrong?

![AWSAuthError](/media/postImages/original/IMh-8IXZeoR3GqnvWCV6XAWw)

Thank you

Answer

Hi,

Please take a look at our documentation per endpoint. For example for the Token endpoint request [ https://docs.aws.amazon.com/cognito/latest/developerguide/token-endpoint.html ] the error means:

> Client authentication failed. For example, when the client includes client_id and client_secret in the authorization header, but there's no such client with that client_id and client_secret.

There is a high chance you did not provide the Authorization header for a confidential client in the form of `Basic

Cognito Authorization using ASP.Net Core

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