Mattermost AWS Install Issue

I was blocked too until I found out you need to input your server IP in this file

/etc/nginx/sites-available/mattermost

It looks like this

location / {
client_max_body_size 50M;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
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_pass http://10.10.10.2:8065;
}
}

change 10.10.10.2 to your IP