SSL on 8443

Heya, I am hosting a ptero panel and have a node on uk.blocksin.net which is accessed via ssl at port 8443, when I go to https://uk.blocksin.net:8443 there is an ssl handshake error. I have full strict mode enabled and this is my nginx config am I doing something wrong?
server {
    listen 8443 ssl http2;
    server_name uk.blocksin.net;

    client_max_body_size 100m;
    client_body_timeout 120s;

    sendfile off;

    ssl_certificate /etc/ssl/panel.blocksin.pem;
    ssl_certificate_key /etc/ssl/panel.blocksin.key;
    ssl_session_cache shared:SSL:10m;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
    ssl_prefer_server_ciphers on;

    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Robots-Tag none;
    add_header Content-Security-Policy "frame-ancestors 'self'";
    add_header X-Frame-Options DENY;
    add_header Referrer-Policy same-origin;
}
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