Missing Authentication Token when trying to use ListUsersRequest

[LoopIssuer]

Describe the bug

I got the error, when trying to use ListUsersRequest (in forgotten password flow )

Missing Authentication Token Amazon.Runtime.Internal.HttpErrorResponseException: Exception of type 'Amazon.Runtime.Internal.HttpErrorResponseException' was thrown.

 private async Task<ListUsersResponse> FindUsersByEmailAddress(string mail)
        {
            ListUsersRequest listUsersRequest = new ListUsersRequest
            {
                UserPoolId = _cognitoCredentials.UserPoolId, 
                Filter = $"email=\"{mail}\""
            };
            return await _provider.ListUsersAsync(listUsersRequest);
        }

Expected Behavior

No error, get a list of registered users from Cognito.

Current Behavior

Error is thrown: Missing Authentication Token Amazon.Runtime.Internal.HttpErrorResponseException: Exception of type 'Amazon.Runtime.Internal.HttpErrorResponseException' was thrown.

Reproduction Steps

Use this method to get list of available users:

private async Task<ListUsersResponse> FindUsersByEmailAddress(string mail)
        {
            ListUsersRequest listUsersRequest = new ListUsersRequest
            {
                UserPoolId = _cognitoCredentials.UserPoolId, 
                Filter = $"email=\"{mail}\""
            };
            return await _provider.ListUsersAsync(listUsersRequest);
        }

Possible Solution

No response

Additional Information/Context

No response

AWS .NET SDK and/or Package version used

Unity 2021.3.9 Aws sdk .net

Targeted .NET Platform

.Net 4.x

Operating System and version

Windows 11

[ashishdhingra]

Hi @TomaszWozniakMosina,

Good morning.

Unfortunately, the issue is not reproducible using the below code (only for demonstration purposes):

using Amazon.CognitoIdentityProvider;
using Amazon.CognitoIdentityProvider.Model;
using System.Threading.Tasks;

namespace TestConsoleApp_NetFramework
{
    internal class Program
    {
        static string userPoolId = "<<user-pool-id>>";

        static void Main(string[] args)
        {
            string email = "<<valid-email-address>>";
            var response = ListCognitoUsers(userPoolId, email).Result;
        }

        private static async Task<ListUsersResponse> ListCognitoUsers(string userPoolId, string email)
        {
            AmazonCognitoIdentityProviderClient client = new AmazonCognitoIdentityProviderClient(Amazon.RegionEndpoint.USEast2); // Set the region endpoint appropriately.
            var request = new ListUsersRequest() { UserPoolId = userPoolId, Filter = $"email=\"{email}\"" };
            return await client.ListUsersAsync(request);
        }
    }
}

Please check if you have configured the AWS credentials properly (with proper IAM policy/permission to list users) in your profile chain to access Cognito service.

Thanks, Ashish

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