You need to add in your nginx config :

upstream odoo {
    server 127.0.0.1:8070;
}

upstream odoochat {
    server 127.0.0.1:8072 weight=1 fail_timeout=0;
}

location /websocket {
                ...
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "Upgrade";
		proxy_pass http://odoochat;
                ...
location / {
	    proxy_redirect off;	    
	    proxy_pass http://odoo;
	}




And in your odoo.conf :
proxy_mode = True
xmlrpc_port = 8070
xmlrpc_interface = 127.0.0.1
gevent_port = 8072 (default in odoo16)
workers = 2 or more