HTTP/1.1 400 Bad Request: missing required Host header

I have a nginx reverse proxy (version 1.22.1) and cannot seem to figure why it is throwing this warning.

Below is my config, any help is greatly appreciated, this is a personal self hosted server that I fiddle with when I have the time, been at this off an on for over 6 months without a resolution. Any help is greatly appreciated.

upstream backend {
server 192.X.X.X:8065;
}

proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=mattermost_cache:10m max_size=3g inactive=120m use_temp_path=off;

server {
listen 80;
server_name chat.tld.com;
return 301 https://$server_name$request_uri;
}

server {
listen 443 ssl http2;
server_name chat.tld.com;

ssl on;
ssl_certificate /etc/nginx/ssl/ssl-bundle.crt;
ssl_certificate_key /etc/nginx/ssl/server.key;
ssl_dhparam /etc/nginx/ssl/dhparam.pem;
ssl_session_timeout 5m;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers AES256+EECDH:AES256+EDH:!aNULL;
ssl_ecdh_curve secp384r1:prime256v1;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:TLS:2m;


location ~ /api/v[0-9]+/(users/)?websocket$ {
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
client_max_body_size 50M;
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Frame-Options SAMEORIGIN;
proxy_buffers 256 16k;
proxy_buffer_size 16k;
proxy_read_timeout 600s;
proxy_pass http://backend;

}

location / {
client_max_body_size 50M;
proxy_set_header Connection "";
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Frame-Options SAMEORIGIN;
proxy_buffers 256 16k;
proxy_buffer_size 16k;
proxy_read_timeout 600s;
proxy_cache mattermost_cache;
proxy_cache_revalidate on;
proxy_cache_min_uses 2;
proxy_cache_use_stale timeout;
proxy_cache_lock on;
proxy_pass http://backend;
proxy_http_version 1.1;
}
}