SSL but no HTTPS on subdomain

Hello. I have set up a droplet with Nginx, running both a Pleroma social media server at social.url.com and a Wordpress blog at blog.url.com. I have obtained SSL certificates for all subdomains via Let’s Encrypt / Certbot, and they are working - I can go to https://blog.url.com just fine, but when I go to blog.url.com it loads over HTTP instead of HTTPS.

Here is the current server block for the Wordpress blog:

server {
    listen 80;
    server_name blog.url.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl;
    ssl_session_timeout 5m;
    ssl_certificate     /etc/letsencrypt/live/blog.url.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/blog.url.com/privkey.pem;
    server_name         blog.ulr.com;
    root                /var/www/html/blog.url.com/public_html;
    index               index.php;

    location / {
      try_files $uri $uri/ =404;
    }

    location ~* \.php$ {
      fastcgi_pass unix:/run/php/php7.4-fpm.sock;
      include          fastcgi_params;
      fastcgi_param    SCRIPT_FILENAME    $document_root$fastcgi_script_name;
      fastcgi_param    SCRIPT_NAME        $fastcgi_script_name;
    }
}

HTTPS is working just fine on the Pleroma server at social.url.com.

What have I got wrong here? Like I said, HTTPS works if you force it in the browser, but if you just type blog.url.com it brings it up unencrypted by default.

Thank you for your time. I assure you, I have Googled myself blind finding half-answers and things completely unrelated to my situation. Nothing so far has worked.