www subdomain not working on AWS

I am hosting this site https://whitewaterwriters.com/ on an AWS instance.

I'd like the url https://www.whitewaterwriters.com/ to work as well, but it doesn't.

I understand that this happens in a 'hosted zone' in AWS. Here's my hosted zone:

...and I understand that I have put in the subdomain redirection properly.

I run a test and get:

which suggests that I'm on the right lines.

It's possible that the issue is that I don't have a TLS cert for https://www.whitewaterwriters.com/ yet, but I can't get one of those without the domain being visible, and my nginx doesn't allow it, so I've altered my nginx.conf to

   server {
        listen       80;
        listen       [::]:80;
        server_name  www.whitewaterwriters.com;
        location /{
                root /usr/share/nginx/html/whitewaterwriters-site/_site/;
        }

    }


    server {
        listen       80;
        listen       [::]:80;
        server_name  whitewaterwriters.com;
        return 301 https://$server_name$request_uri;
}

so that http://www.whitewaterwriters.com/ should at least work without the https, but no luck.

What am I doing wrong?

EDIT:

I've now added an a-record as well: