Django DisallowedHost: “Invalid HTTP_HOST header” despite correct ALLOWED_HOSTS and nginx configuration

I am running a Django 4.2.20 application on an Ubuntu server with Gunicorn and nginx as reverse proxy. However, I get the following error when I access the website via the public IP:

Exception Type: DisallowedHost at /
Exception Value: Invalid HTTP_HOST header: '89.168.121.242,89.168.121.242'. The domain name provided is not valid according to RFC 1034/1035.

I have already checked the following: ALLOWED_HOSTS in settings.py:

ALLOWED_HOSTS = ['ipaddress', 'localhost']

nginx configuration (/etc/nginx/sites-available/familyapp):

server {
    listen 80;
    server_name ipaddress;

    location /static/ {
        alias /home/familyapp/FamilyApp/familyapp/static/;
    }

    location /media/ {
        alias /home/familyapp/FamilyApp/media/;
    }

    location / {
        include proxy_params;
        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_pass http://unix:/home/ubuntu/sockets/gunicorn.sock;
    }
}

nginx syntax check & restart

sudo nginx -t # No errors
sudo systemctl restart nginx
sudo systemctl restart gunicorn

Gunicorn started manually

gunicorn --bind unix:/home/ubuntu/s

There's an extra dot (.) at the end of '89.168.121.222.', which makes it invalid, remove the dot.

ALLOWED_HOSTS = ['89.168.121.222', 'localhost']

Fix the nginx server_name and proxy_set_header.

server {
    listen 80;
    server_name 89.168.121.222;

    location /static/ {
        alias /home/familyapp/FamilyApp/familyapp/static/;
    }

    location /media/ {
        alias /home/familyapp/FamilyApp/media/;
    }

    location / {
        include proxy_params;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://unix:/home/ubuntu/sockets/gunicorn.sock;
    }
}
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