How can we get Rekognition Dual-Stack Endpoints to resolve in DNS?

Question

The AWS Rekognition endpoints do not resolve when DualStack is enabled.  The AWS .NET SDK's endpoints.json looks like this:

```
          {
            "dnsSuffix": "api.aws",
            "hostname": "{service}.{region}.{dnsSuffix}",
            "tags": [
              "dualstack"
            ]
          }
```
For example, `rekognition.us-west-1.api.aws` does not resolve:
   https://dnschecker.org/all-dns-records-of-domain.php?query=rekognition.us-west-1.api.aws&rtype=ALL&dns=google

neither does `rekognition.us-west-2.api.aws` or `rekognition.us-east-1.api.aws`.

Answer

UseDualStackEndpoint=true is broken for Amazon SES too.  The resulting DNS names do not resolve (at least not outside AWS' network).  E.g., "email.us-west-2.api.aws" or "email.us-west-1.api.aws".  Several DNS servers have been tried.  Here's Google saying it doesn't resolve:
https://dnschecker.org/all-dns-records-of-domain.php?query=email.us-west-2.api.aws&rtype=ALL&dns=google

The answer seem to be that AWS doesn't actually work with IPv6 ("UseDualStackEndpoint=true").

Answer

Can we use the "useDualstackEndpoint" described in the following document to solve this problem?  
https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-rekognition/interfaces/endpointsinputconfig.html

How can we get Rekognition Dual-Stack Endpoints to resolve in DNS?

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